ChiSquare in SPSS Input data, define groups etc. Run the analysis. Paste the Descriptive Statistics table. In Crosstabulation, paste the information on percentages. Paste the nal output the ChiSquare Tests. Phi and Cramr's V are measures of the strength of association between two categorical variables. Phi is used with 2 X 2 contingency tables. You have two categorical variableseach variable has only two categories. Phi is calculated by taking the chisquare value and dividing it by the sample size and then taking the square root of this value. If one of the two categorical variables contains more than two categories, Cramer's V is preferred to phi because phi fails to reach its minimum value of 0 (indicating no association) in these circumstances