Probability Distribution Functions

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.

Normal (Gaussian)

z
p

Note: p is the area in the two tails of the distribution

Student t

t
d.f.
p

Note: p is the area in the two tails of the distribution

Chi Square

ChiSq
d.f.
p

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

Fisher F

F
d.f.1 (num)
d.f.2 (denom)
p

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