##
Probability Distribution
Functions

(Revised
2014-07-29: provide fairly good approximate results for fractional
degrees of freedom

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.
Caution:
This page gives completely
accurate results when the degrees of freedom (d.f.) are whole numbers, but
only approximate
results for fractional d.f. The approximations are usually good to at least 2 or
3 decimal places, even for very small d.f., and get better for larger d.f.

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

Return to the Interactive
Statistics page
or to the JCP Home Page

Send e-mail to John C. Pezzullo at statpages.org@gmail.com