This function computes the value of Cramer's V for a two-way table.
Two-way table, or matrix, of counts.
If X^2 is the usual chi-squared measure of association in a two-way table, Cramer's V is sqrt (X^2 / (n * (k-1))), where n is the total number of observations in the table, and k is min (nrow(table), ncol(table)).
Numeric value of Cramer's V, with name "X-squared".
Agresti, "Categorical Data Analysis," p. 75, where V^2 is used.
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