Volker (2006) analyzed methods and approaches for reporting effect size in psychological research. In his assessment of estimates for effect size using the chi-square test, he wrote, Given that Cramer's V is an extension of the coefficient, the values of effect size f and Cramer's V will be identical when a 2 × 2 [chi-square] is analyzed. (Volker, 2006, p. 666)
(a) Which coefficient is Volker (2006) referring to?
(b) Why are the two values of effect size identical when analyzing a 2 × 2 chisquare?