Probability Density Functions

A probability density function (a.k.a. the pdf) gives the probability density for a particular distribution. The area under it is 1. Fathom's names are <something>Density or <something>Probability (for discrete distributions). Examples are normalDensity(x, mu, sigma), which is the familiar normal curve, and binomialProbability(x, n, p), which is the binomial probability of x successes in n tries of probability p.

Its integral is a cumulative probability function.