The internal rate of return (IRR) is a method of calculating rate of return.
The modified Dietz method is a measure of the ex post (i.e. historical) performance of an investment portfolio in the presence of external flows.
In finance, the net present value (NPV) or net present worth (NPW) is a measurement of profit calculated by subtracting the present values (PV) of cash outflows (including initial cost) from the present values of cash inflows over a period of time.
Private equity typically refers to investment funds organized as limited partnerships that are not publicly traded and whose investors are typically large institutional investors, university endowments, or wealthy individuals.
In finance, return is a profit on an investment.
The rate of return on a portfolio is the ratio of income generated (whether realized or not) by a portfolio to the size of the portfolio.
The simple Dietz method is a means of measuring historical investment portfolio performance, compensating for external flows into/out of the portfolio during the period.