(Revised 2011-07-01: Fixed problem with Chi-square for very large chi-square and degrees of freedom. Thank you Heinz-Jurgen!)

This screen computes the probability distribution
functions
and their inverses for four common statistical distributions.

Note: Before using this page for the first time, make sure you read the JavaStat user interface guidelines for important information about interacting with JavaStat pages.

**Note**: p is a "**one-tailed**" area
(from F to infinity)

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Send e-mail to John C. Pezzullo at