chi2P ( chi df -- p ) - Factor Documentation

Vocabulary
math.extras

Inputs and outputs

chi	a real
df	a real
p	a real

Word description
Returns the inverse chi-squared value according to P(chi|df) = P(df/2,chi/2).

Definition

USING: kernel math math.extras.private math.order ;

IN: math.extras

: chi2P ( chi df -- p )
    dup df-check [ 2.0 / ] [ 2 /i ] bi* (chi2P) 1.0 min ;