Goodman and Kruskall's gamma as an effect size. Yule's Q is a special case where coef1 and coef2 both have two coefficients, and is a symmetric effect size for the interaction of two experimental factors.

effect_gamma(coef1, coef2)

## Arguments

coef1 Column numbers in the design matrix for the first condition, in some meaningful order. Corresponding column numbers for the second condition.

## Value

An object defining how to calculate an effect size.

## Details

effect_gamma_log2 is adapted to work with log2 scaled coefficients. This is almost certainly the version you want.