Distribution Function -- from Wolfram MathWorld
The distribution function D(x), also called the cumulative distribution function (CDF) or cumulative frequency function, describes the probability that a variate X takes on a value less than or equal to a number x. The distribution function is sometimes also denoted F(x) (Evans et al. 2000, p. 6). The distribution function is therefore related to a continuous probability density function P(x) by D(x) = P(X<=x) (1) = int_(-infty)^xP(xi)dxi, (2) so P(x) (when it exists) is simply the...| mathworld.wolfram.com
