cramerV = function(sum12, sum1, sum2, len){
# Cramer's (V) coefficient
# https://en.wikipedia.org/wiki/Phi_coefficient
# http://www.aliquote.org/pub/3531_ftp.pdf
len = as.numeric(len);
sqrt(len / (sum1 * (len - sum1) * (sum2) * (len - sum2))) *
(sum12 * (len + (sum12- sum1 - sum2)) -
as.numeric(sum1-sum12) * (sum2-sum12));
}
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