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chi2 ( actual expected -- n )


Vocabulary
math.extras

Inputs and outputs
actuala sequence
expecteda sequence
na 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 ;