chi2 ( actual expected -- n )

Vocabulary

math.extras

Inputs

actual	a sequence
expected	a sequence

Outputs

n

a real

Word description

Return the chi-squared metric between actual and expected observations.

Definition

USING: kernel math sequences ;

IN: math.extras

: chi2 ( actual expected -- n )
    0 [ dup 0 > [ [ - sq ] keep / + ] [ 2drop ] if ] 2reduce ;