What Is a Probability Density Function (PDF)? The probability density function (PDF) is an analytical technique that outlines how likely different outcomes are across a range of possibilities.

This paper describes and discusses graphical techniques, based on the primitive empirical cumulative distribution function and on quantile (Q - Q) plots, percent (P - P) plots and hybrids of these, ...

Probability distributions are characterized as either discrete or continuous, and as working as either a probability density function, or a cumulative distribution.