Chapter 17

Chi-Square Statistic

df_{χ[sup]2[/sup]} = k − 1 (for chi-square test for goodness-of-fit)

df_{χ[sup]2[/sup]} = (k_row − 1)(k_column − 1) (for chi-square test for independence)

Expected frequency for each cell =

where we use the overall number of participants, N, along with the totals for the rows and columns for each particular cell.

Effect size for the Chi-Square Statistic

where we use the smaller of the row and column degrees of freedom.