Well, I wouldn't call it refereed so much as crowd sourced, but https://en.wikipedia.org/wiki/Cram%C3%A9r%27s_V  provides a lot of insight to those of us who aren't familiar with it. The formulas there use k to index the number of columns and r to index the number of rows, so we are not limited to square matrices. Calculating using the summation formulas given doesn't seem hampered by cells with zero counts, so that isn't an issue. The biggest issue with the use of Cramer's V is that it is severely biased toward 1, and unbalanced data increases this.   Is that of any help to you?   SteveDenham ... View more