Question: Choosing effect size. Volker (2006) analyzed methods and approaches for reporting effect size in psychological research. In his assessment of estimates for effect size using

Choosing effect size. 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 φ and Cramer’s V will be identical when a 2 × 2 [chi-square] is analyzed. (Volker, 2006, p. 666)

1. Which coefficient is Volker (2006) referring to?

2. Why are the two values of effect size identical when analyzing a 2 × 2 chi-square?

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