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Correlation does not imply causation

Index Correlation does not imply causation

In statistics, many statistical tests calculate correlations between variables and when two variables are found to be correlated, it is tempting to assume that this shows that one variable causes the other. [1]

134 relations: Affirming the consequent, Al-Ghazali, Alcohol intoxication, Alignments of random points, Apophenia, Aristotle, Bald–hairy, Bible code, Biology, Blinded experiment, British Medical Association, Butterfly effect, Cannabis (drug), Carbon dioxide, Causality, Cheshire, Connecticut, Cholesterol, Circular reasoning, Classical mechanics, CNN, Coefficient of determination, Coincidence, Confounding, Confusion of the inverse, Convergent cross mapping, Coronary artery disease, Correlation and dependence, Correlation does not imply causation, Counterfactual conditional, Data dredging, David Hume, Design of experiments, Direct election, Discipline (academia), East Lansing, Michigan, Economics, Education economics, Edward Tufte, Effect size, Epidemiology, Exogeny, Experiment, Fallacy, Fever, Field (physics), Flying Spaghetti Monster, Four causes, French paradox, Gateway drug theory, George Davey Smith, ..., Granger causality, Gross domestic product, Health effects of tobacco, High-density lipoprotein, Human capital, Immanuel Kant, Impact (mechanics), Infant, Instrumental variables estimation, Journal of the American Statistical Association, Latin, Law, Logic, Logical consequence, London, Look-elsewhere effect, Louse, Material conditional, Mechanism (philosophy), Mental disorder, Michigan State University Press, Middle Ages, Mierscheid law, Multiple comparisons problem, Nature (journal), Nature Publishing Group, Near-sightedness, Necessity and sufficiency, New York City, Nonlinear system, Normally distributed and uncorrelated does not imply independent, NRS social grade, Obesity, Occasionalism, Ohio State University, P-value, Penguin Books, Penn Presbyterian Medical Center, Philosophy, Physical law, Physics, Post hoc analysis, Post hoc ergo propter hoc, Postmenopausal hormone therapy, Potential energy, Predation, Problem of induction, Quantum mechanics, Questionable cause, Randomized controlled trial, Recreational drug use, Redskins Rule, Regression analysis, René Descartes, Reproducibility, Ronald Fisher, Screening (economics), Second law of thermodynamics, Self-medication, Signalling (economics), Social class, Social Democratic Party of Germany, Social science, Spacetime, Spurious relationship, Statistical hypothesis testing, Statistical mechanics, Statistical significance, Statistics, Swimming, Television, Testing hypotheses suggested by the data, The BMJ, The Signal and the Noise, Thermodynamic free energy, Thermodynamics, Thermometer, Tobacco industry, Twin study, United States presidential election, 2004, United States presidential election, 2012, University of Pennsylvania, Variable (mathematics), Washington Redskins. Expand index (84 more) »

Affirming the consequent

Affirming the consequent, sometimes called converse error, fallacy of the converse or confusion of necessity and sufficiency, is a formal fallacy of inferring the converse from the original statement.

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Al-Ghazali

Al-Ghazali (full name Abū Ḥāmid Muḥammad ibn Muḥammad al-Ghazālī أبو حامد محمد بن محمد الغزالي; latinized Algazelus or Algazel, – 19 December 1111) was one of the most prominent and influential philosophers, theologians, jurists, and mysticsLudwig W. Adamec (2009), Historical Dictionary of Islam, p.109.

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Alcohol intoxication

Alcohol intoxication, also known as drunkenness or alcohol poisoning, is negative behavior and physical effects due to the recent drinking of ethanol (alcohol).

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Alignments of random points

Alignments of random points in the plane can be demonstrated by statistics to be counter-intuitively easy to find when a large number of random points are marked on a bounded flat surface.

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Apophenia

Apophenia is the tendency to perceive connections and meaning between unrelated things.

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Aristotle

Aristotle (Ἀριστοτέλης Aristotélēs,; 384–322 BC) was an ancient Greek philosopher and scientist born in the city of Stagira, Chalkidiki, in the north of Classical Greece.

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Bald–hairy

Bald–hairy (лысый–волосатый) is a common joke in Russian political discourse, referring to the empirical rule of the state leaders' succession defined as a change of a bald leader to a hairy one and vice versa.

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Bible code

The Bible code (הצופן התנ"כי, hatzofen hatanachi), also known as the Torah code, is a purported set of secret messages encoded within the Hebrew text of the Torah.

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Biology

Biology is the natural science that studies life and living organisms, including their physical structure, chemical composition, function, development and evolution.

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Blinded experiment

A blind or blinded-experiment is an experiment in which information about the test is masked (kept) from the participant, to reduce or eliminate bias, until after a trial outcome is known.

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British Medical Association

The British Medical Association (BMA) is the professional association and registered trade union for doctors in the United Kingdom.

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Butterfly effect

In chaos theory, the butterfly effect is the sensitive dependence on initial conditions in which a small change in one state of a deterministic nonlinear system can result in large differences in a later state.

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Cannabis (drug)

Cannabis, also known as marijuana among other names, is a psychoactive drug from the ''Cannabis'' plant intended for medical or recreational use.

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Carbon dioxide

Carbon dioxide (chemical formula) is a colorless gas with a density about 60% higher than that of dry air.

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Causality

Causality (also referred to as causation, or cause and effect) is what connects one process (the cause) with another process or state (the effect), where the first is partly responsible for the second, and the second is partly dependent on the first.

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Cheshire, Connecticut

Cheshire, formerly known as New Cheshire Parish, is a town in New Haven County, Connecticut, United States.

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Cholesterol

Cholesterol (from the Ancient Greek chole- (bile) and stereos (solid), followed by the chemical suffix -ol for an alcohol) is an organic molecule.

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Circular reasoning

Circular reasoning (circulus in probando, "circle in proving"; also known as circular logic) is a logical fallacy in which the reasoner begins with what they are trying to end with.

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Classical mechanics

Classical mechanics describes the motion of macroscopic objects, from projectiles to parts of machinery, and astronomical objects, such as spacecraft, planets, stars and galaxies.

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CNN

Cable News Network (CNN) is an American basic cable and satellite television news channel and an independent subsidiary of AT&T's WarnerMedia.

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Coefficient of determination

In statistics, the coefficient of determination, denoted R2 or r2 and pronounced "R squared", is the proportion of the variance in the dependent variable that is predictable from the independent variable(s).

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Coincidence

A coincidence is a remarkable concurrence of events or circumstances that have no apparent causal connection with one another.

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Confounding

In statistics, a confounder (also confounding variable, confounding factor or lurking variable) is a variable that influences both the dependent variable and independent variable causing a spurious association.

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Confusion of the inverse

Confusion of the inverse, also called the conditional probability fallacy or the inverse fallacy, is a logical fallacy whereupon a conditional probability is equivocated with its inverse: That is, given two events A and B, the probability of A happening given that B has happened is assumed to be about the same as the probability of B given A. More formally, P(A|B) is assumed to be approximately equal to P(B|A).

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Convergent cross mapping

Convergent cross mapping (CCM) is a statistical test for a cause-and-effect relationship between two time series variables that, like the Granger causality test, seeks to resolve the problem that correlation does not imply causation.

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Coronary artery disease

Coronary artery disease (CAD), also known as ischemic heart disease (IHD), refers to a group of diseases which includes stable angina, unstable angina, myocardial infarction, and sudden cardiac death.

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Correlation and dependence

In statistics, dependence or association is any statistical relationship, whether causal or not, between two random variables or bivariate data.

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Correlation does not imply causation

In statistics, many statistical tests calculate correlations between variables and when two variables are found to be correlated, it is tempting to assume that this shows that one variable causes the other.

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Counterfactual conditional

A counterfactual conditional (abbreviated), is a conditional containing an if-clause which is contrary to fact.

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Data dredging

Data dredging (also data fishing, data snooping, and '''''p'''''-hacking) is the use of data mining to uncover patterns in data that can be presented as statistically significant, without first devising a specific hypothesis as to the underlying causality.

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David Hume

David Hume (born David Home; 7 May 1711 NS (26 April 1711 OS) – 25 August 1776) was a Scottish philosopher, historian, economist, and essayist, who is best known today for his highly influential system of philosophical empiricism, skepticism, and naturalism.

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Design of experiments

The design of experiments (DOE, DOX, or experimental design) is the design of any task that aims to describe or explain the variation of information under conditions that are hypothesized to reflect the variation.

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Direct election

Direct election is a system of choosing political officeholders in which the voters directly cast ballots for the person, persons, or political party that they desire to see elected.

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Discipline (academia)

An academic discipline or academic field is a branch of knowledge.

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East Lansing, Michigan

East Lansing is a city in the U.S. state of Michigan directly east of Lansing, the state capital.

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Economics

Economics is the social science that studies the production, distribution, and consumption of goods and services.

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Education economics

Education economics or the economics of education is the study of economic issues relating to education, including the demand for education, the financing and provision of education, and the comparative efficiency of various educational programs and policies.

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Edward Tufte

Edward Rolf Tufte (born March 14, 1942) is an American statistician and professor emeritus of political science, statistics, and computer science at Yale University.

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Effect size

In statistics, an effect size is a quantitative measure of the magnitude of a phenomenon.

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Epidemiology

Epidemiology is the study and analysis of the distribution (who, when, and where) and determinants of health and disease conditions in defined populations.

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Exogeny

In a variety of contexts, exogeny or exogeneity is the fact of an action or object originating externally.

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Experiment

An experiment is a procedure carried out to support, refute, or validate a hypothesis.

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Fallacy

A fallacy is the use of invalid or otherwise faulty reasoning, or "wrong moves" in the construction of an argument.

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Fever

Fever, also known as pyrexia and febrile response, is defined as having a temperature above the normal range due to an increase in the body's temperature set-point.

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Field (physics)

In physics, a field is a physical quantity, represented by a number or tensor, that has a value for each point in space and time.

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Flying Spaghetti Monster

The Flying Spaghetti Monster (FSM) is the deity of the Church of the Flying Spaghetti Monster, or Pastafarianism.

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Four causes

The "four causes" are elements of an influential principle in Aristotelian thought whereby explanations of change or movement are classified into four fundamental types of answer to the question "why?".

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French paradox

The French paradox is a catchphrase, first used in the late 1980s, that summarizes the apparently paradoxical epidemiological observation that French people have a relatively low incidence of coronary heart disease (CHD), while having a diet relatively rich in saturated fats, in apparent contradiction to the widely held belief that the high consumption of such fats is a risk factor for CHD.

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Gateway drug theory

Gateway drug theory (alternatively, stepping-stone theory, escalation hypothesis, or progression hypothesis) is a comprehensive catchphrase for the medical theory that the use of a psychoactive drug can be coupled to an increased probability of the use of further drugs.

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George Davey Smith

George Davey Smith (born 9 May 1959) is a British epidemiologist.

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Granger causality

The Granger causality test is a statistical hypothesis test for determining whether one time series is useful in forecasting another, first proposed in 1969.

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Gross domestic product

Gross domestic product (GDP) is a monetary measure of the market value of all final goods and services produced in a period (quarterly or yearly) of time.

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Health effects of tobacco

Tobacco use has predominantly negative effects on human health and concern about health effects of tobacco has a long history.

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High-density lipoprotein

High-density lipoproteins (HDL) are one of the five major groups of lipoproteins.

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Human capital

Human capital is a term popularized by Gary Becker, an economist and Nobel Laureate from the University of Chicago, and Jacob Mincer.

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Immanuel Kant

Immanuel Kant (22 April 1724 – 12 February 1804) was a German philosopher who is a central figure in modern philosophy.

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Impact (mechanics)

In mechanics, an impact is a high force or shock applied over a short time period when two or more bodies collide.

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Infant

An infant (from the Latin word infans, meaning "unable to speak" or "speechless") is the more formal or specialised synonym for "baby", the very young offspring of a human.

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Instrumental variables estimation

In statistics, econometrics, epidemiology and related disciplines, the method of instrumental variables (IV) is used to estimate causal relationships when controlled experiments are not feasible or when a treatment is not successfully delivered to every unit in a randomized experiment.

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Journal of the American Statistical Association

The Journal of the American Statistical Association (JASA) is the primary journal published by the American Statistical Association, the main professional body for statisticians in the United States.

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Latin

Latin (Latin: lingua latīna) is a classical language belonging to the Italic branch of the Indo-European languages.

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Law

Law is a system of rules that are created and enforced through social or governmental institutions to regulate behavior.

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Logic

Logic (from the logikḗ), originally meaning "the word" or "what is spoken", but coming to mean "thought" or "reason", is a subject concerned with the most general laws of truth, and is now generally held to consist of the systematic study of the form of valid inference.

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Logical consequence

Logical consequence (also entailment) is a fundamental concept in logic, which describes the relationship between statements that hold true when one statement logically follows from one or more statements.

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London

London is the capital and most populous city of England and the United Kingdom.

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Look-elsewhere effect

The look-elsewhere effect is a phenomenon in the statistical analysis of scientific experiments, particularly in complex particle physics experiments, where an apparently statistically significant observation may have actually arisen by chance because of the size of the parameter space to be searched.

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Louse

Louse (plural: lice) is the common name for members of the order Phthiraptera, which contains nearly 5,000 species of wingless insect.

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Material conditional

The material conditional (also known as material implication, material consequence, or simply implication, implies, or conditional) is a logical connective (or a binary operator) that is often symbolized by a forward arrow "→".

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Mechanism (philosophy)

Mechanism is the belief that natural wholes (principally living things) are like complicated machines or artifacts, composed of parts lacking any intrinsic relationship to each other.

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Mental disorder

A mental disorder, also called a mental illness or psychiatric disorder, is a behavioral or mental pattern that causes significant distress or impairment of personal functioning.

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Michigan State University Press

Michigan State University Press is the scholarly publishing arm of Michigan State University, the nation’s pioneer land-grant university (the institution that served as the prototype for schools established under the Morrill Land-Grant Acts of 1862).

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Middle Ages

In the history of Europe, the Middle Ages (or Medieval Period) lasted from the 5th to the 15th century.

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Mierscheid law

The Mierscheid law is hypothesis, published in the German magazine Vorwärts on 14 July 1983 and attributed to the fictitious politician Jakob Maria Mierscheid.

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Multiple comparisons problem

In statistics, the multiple comparisons, multiplicity or multiple testing problem occurs when one considers a set of statistical inferences simultaneously or infers a subset of parameters selected based on the observed values.

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Nature (journal)

Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.

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Nature Publishing Group

Nature Publishing Group is a division of the international scientific publishing company Springer Nature that publishes academic journals, magazines, online databases, and services in science and medicine.

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Near-sightedness

Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina.

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Necessity and sufficiency

In logic, necessity and sufficiency are terms used to describe an implicational relationship between statements.

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New York City

The City of New York, often called New York City (NYC) or simply New York, is the most populous city in the United States.

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Nonlinear system

In mathematics and science, a nonlinear system is a system in which the change of the output is not proportional to the change of the input.

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Normally distributed and uncorrelated does not imply independent

In probability theory, two random variables being linearly uncorrelated does not imply their independence (however, for some measures of non-linear correlation such as the distance correlation, uncorrelated implies independent).

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NRS social grade

The NRS social grades are a system of demographic classification used in the United Kingdom.

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Obesity

Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have a negative effect on health.

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Occasionalism

Occasionalism is a philosophical theory about causation which says that created substances cannot be efficient causes of events.

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Ohio State University

The Ohio State University, commonly referred to as Ohio State or OSU, is a large, primarily residential, public university in Columbus, Ohio.

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P-value

In statistical hypothesis testing, the p-value or probability value or asymptotic significance is the probability for a given statistical model that, when the null hypothesis is true, the statistical summary (such as the sample mean difference between two compared groups) would be the same as or of greater magnitude than the actual observed results.

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Penguin Books

Penguin Books is a British publishing house.

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Penn Presbyterian Medical Center

Penn Presbyterian Medical Center ("Presby") is a hospital located in the University City section of West Philadelphia.

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Philosophy

Philosophy (from Greek φιλοσοφία, philosophia, literally "love of wisdom") is the study of general and fundamental problems concerning matters such as existence, knowledge, values, reason, mind, and language.

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Physical law

A physical law or scientific law is a theoretical statement "inferred from particular facts, applicable to a defined group or class of phenomena, and expressible by the statement that a particular phenomenon always occurs if certain conditions be present." Physical laws are typically conclusions based on repeated scientific experiments and observations over many years and which have become accepted universally within the scientific community.

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Physics

Physics (from knowledge of nature, from φύσις phýsis "nature") is the natural science that studies matterAt the start of The Feynman Lectures on Physics, Richard Feynman offers the atomic hypothesis as the single most prolific scientific concept: "If, in some cataclysm, all scientific knowledge were to be destroyed one sentence what statement would contain the most information in the fewest words? I believe it is that all things are made up of atoms – little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another..." and its motion and behavior through space and time and that studies the related entities of energy and force."Physical science is that department of knowledge which relates to the order of nature, or, in other words, to the regular succession of events." Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves."Physics is one of the most fundamental of the sciences. Scientists of all disciplines use the ideas of physics, including chemists who study the structure of molecules, paleontologists who try to reconstruct how dinosaurs walked, and climatologists who study how human activities affect the atmosphere and oceans. Physics is also the foundation of all engineering and technology. No engineer could design a flat-screen TV, an interplanetary spacecraft, or even a better mousetrap without first understanding the basic laws of physics. (...) You will come to see physics as a towering achievement of the human intellect in its quest to understand our world and ourselves."Physics is an experimental science. Physicists observe the phenomena of nature and try to find patterns that relate these phenomena.""Physics is the study of your world and the world and universe around you." Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over the last two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the scientific revolution in the 17th century, these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy. Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.

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Post hoc analysis

In a scientific study, post hoc analysis (from Latin post hoc, "after this") consists of analyses that were not specified before seeing the data.

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Post hoc ergo propter hoc

Post hoc ergo propter hoc (Latin: "after this, therefore because of this") is a logical fallacy that states "Since event Y followed event X, event Y must have been caused by event X." It is often shortened simply to post hoc fallacy.

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Postmenopausal hormone therapy

Menopausal hormone therapy (MHT), or postmenopausal hormone therapy (PHT, PMHT), also known as hormone replacement therapy in menopause, is a form of hormone replacement therapy (HRT) which is used in postmenopausal, perimenopausal, and surgically menopausal women.

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Potential energy

In physics, potential energy is the energy possessed by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

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Predation

Predation is a biological interaction where a predator (a hunting animal) kills and eats its prey (the organism that is attacked).

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Problem of induction

The problem of induction is the philosophical question of whether inductive reasoning leads to knowledge understood in the classic philosophical sense, highlighting the apparent lack of justification for.

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Quantum mechanics

Quantum mechanics (QM; also known as quantum physics, quantum theory, the wave mechanical model, or matrix mechanics), including quantum field theory, is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles.

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Questionable cause

The questionable cause—also known as causal fallacy, false cause, or non causa pro causa ("non-cause for cause" in Latin)—is a category of informal fallacies in which a cause is incorrectly identified.

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Randomized controlled trial

A randomized controlled trial (or randomized control trial; RCT) is a type of scientific (often medical) experiment which aims to reduce bias when testing a new treatment.

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Recreational drug use

Recreational drug use is the use of a psychoactive drug to induce an altered state of consciousness for pleasure, by modifying the perceptions, feelings, and emotions of the user.

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Redskins Rule

The Redskins Rule is a spurious relationship in which the results of National Football League (NFL) games correlated strongly with the results of subsequent United States presidential elections.

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Regression analysis

In statistical modeling, regression analysis is a set of statistical processes for estimating the relationships among variables.

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René Descartes

René Descartes (Latinized: Renatus Cartesius; adjectival form: "Cartesian"; 31 March 1596 – 11 February 1650) was a French philosopher, mathematician, and scientist.

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Reproducibility

Reproducibility is the closeness of the agreement between the results of measurements of the same measurand carried out under changed conditions of measurement.

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Ronald Fisher

Sir Ronald Aylmer Fisher (17 February 1890 – 29 July 1962), who published as R. A. Fisher, was a British statistician and geneticist.

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Screening (economics)

Screening in economics refers to a strategy of combating adverse selection, one of the potential decision-making complications in cases of asymmetric information, by the agent(s) with less information.

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Second law of thermodynamics

The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time.

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Self-medication

Self-medication is a human behavior in which an individual uses a substance or any exogenous influence to self-administer treatment for physical or psychological ailments.

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Signalling (economics)

In contract theory, signalling (or signaling; see spelling differences) is the idea that one party (termed the agent) credibly conveys some information about itself to another party (the principal).

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Social class

A social class is a set of subjectively defined concepts in the social sciences and political theory centered on models of social stratification in which people are grouped into a set of hierarchical social categories, the most common being the upper, middle and lower classes.

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Social Democratic Party of Germany

The Social Democratic Party of Germany (Sozialdemokratische Partei Deutschlands, SPD) is a social-democratic political party in Germany.

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Social science

Social science is a major category of academic disciplines, concerned with society and the relationships among individuals within a society.

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Spacetime

In physics, spacetime is any mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum.

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Spurious relationship

In statistics, a spurious relationship or spurious correlation is a mathematical relationship in which two or more events or variables are not causally related to each other, yet it may be wrongly inferred that they are, due to either coincidence or the presence of a certain third, unseen factor (referred to as a "common response variable", "confounding factor", or "lurking variable").

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Statistical hypothesis testing

A statistical hypothesis, sometimes called confirmatory data analysis, is a hypothesis that is testable on the basis of observing a process that is modeled via a set of random variables.

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Statistical mechanics

Statistical mechanics is one of the pillars of modern physics.

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Statistical significance

In statistical hypothesis testing, a result has statistical significance when it is very unlikely to have occurred given the null hypothesis.

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Statistics

Statistics is a branch of mathematics dealing with the collection, analysis, interpretation, presentation, and organization of data.

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Swimming

Swimming is the self-propulsion of a person through fresh or salt water, usually for recreation, sport, exercise, or survival.

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Television

Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound.

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Testing hypotheses suggested by the data

In statistics, hypotheses suggested by a given dataset, when tested with the same dataset that suggested them, are likely to be accepted even when they are not true.

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The BMJ

The BMJ is a weekly peer-reviewed medical journal.

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The Signal and the Noise

The Signal and the Noise: Why Most Predictions Fail – but Some Don't (alternatively stylized as The Signal and the Noise: Why So Many Predictions Fail – but Some Don't) is a 2012 book by Nate Silver detailing the art of using probability and statistics as applied to real-world circumstances.

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Thermodynamic free energy

The thermodynamic free energy is the amount of work that a thermodynamic system can perform.

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Thermodynamics

Thermodynamics is the branch of physics concerned with heat and temperature and their relation to energy and work.

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Thermometer

A thermometer is a device that measures temperature or a temperature gradient.

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Tobacco industry

The tobacco industry comprises those persons and companies engaged in the growth, preparation for sale, shipment, advertisement, and distribution of tobacco and tobacco-related products.

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Twin study

Twin studies are studies conducted on identical or fraternal twins.

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United States presidential election, 2004

The United States presidential election of 2004, the 55th quadrennial presidential election, was held on Tuesday, November 2, 2004.

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United States presidential election, 2012

The United States presidential election of 2012 was the 57th quadrennial American presidential election.

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University of Pennsylvania

The University of Pennsylvania (commonly known as Penn or UPenn) is a private Ivy League research university located in University City section of West Philadelphia.

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Variable (mathematics)

In elementary mathematics, a variable is a symbol, commonly an alphabetic character, that represents a number, called the value of the variable, which is either arbitrary, not fully specified, or unknown.

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Washington Redskins

The Washington Redskins are a professional American football team based in the Washington metropolitan area.

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Redirects here:

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References

[1] https://en.wikipedia.org/wiki/Correlation_does_not_imply_causation

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