The F distribution is also known as Snedecor's F distribution or the Fisher–Snedecor distribution.

An f statistic is given by the following formula:

Here, *s*_{1} is the standard deviation of a sample 1 with an *n*_{1} size, *s*_{2} is the standard deviation of a sample 2, where the size *n*_{2}*σ*_{1} is the population standard deviation of a sample *1σ*_{2} is the population standard deviation of a sample 12.

The distribution of all the possible values of **f** statistics is called F distribution. The `d1`

and `d2`

represent the degrees of freedom in the following chart:

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