Why are the Kendall’s tau-b and Cramer’s V different?
When data in the variable are
measured at nominal level of measurement, use Crammer’s V and for ordinal data, use Kendall’s
tau to measure the strength of association between the variables.
Morgan, G., Leech, N., Gloeckner, G., Barrett, K. (2013). IBM SPSS for Introductory Statistics
(5th Ed.). New York, NY