# Probability integral transform

## From Wikipedia, the free encyclopedia

In probability theory, the **probability integral transform** (also known as **universality of the uniform**) relates to the result that data values that are modeled as being random variables from any given continuous distribution can be converted to random variables having a standard uniform distribution.[1] This holds exactly provided that the distribution being used is the true distribution of the random variables; if the distribution is one fitted to the data, the result will hold approximately in large samples.

The result is sometimes modified or extended so that the result of the transformation is a standard distribution other than the uniform distribution, such as the exponential distribution.

The transform was introduced by Ronald Fisher in his 1932 edition of the book Statistical Methods for Research Workers.[2]