# Srangecdf

Srangecdf-func

## Definition:

computes the probability associated with the lower tail of the distribution of the Studentized range statistic.

The externally Studentized range, , for a sample, is defined as:

where is an independent estimate of the standard error of the 's.

For a Studentized range statistic the probability integral, , for degrees of freedom and groups, can be written as:

where ,

## Parameters:

- (input, double)
- the Studentized range statistic,
- (input, double)
- the number of degrees of freedom for the experimental error.
- (input,int)
- the number of groups,
- (output, double)
- the probability.