Performs mcnemar s chisquared test for symmetry of rows and columns in a twodimensional contingency table. The difference between a chisquare test and a mcnemar. This test uses only the number of discordant pairs, that is, the number of pairs for which the control was exposed to the risk factor but the case was not 4 in this example and the number of pairs where the case was exposed. It checks the marginal homogeneity of two dichotomous variables. Spss procedure, interpretation of spss output and reporting for both tests. Chisquare and mcnemar tests in spss department of sociology. Run it in excel using the xlstat addon statistical software. Or it can be used to analyze experimental studies, where the two treatments are given to matched subjects. The standard test considers paired binary response data displayed in a 2x2 contingency table o for example, if you have twins randomly placed in two treatment groups, control and test, you would then test the two treatments groups on a binary outcome, pass or fail.
Spss mcnemar test is a procedure for testing if the proportions of two dichotomous variables are equal in some population. The two variables have been measured on the same cases. Mcnemars test for paired data binghamton university. A marketeer wants to know whether two products are equally appealing. Mcnemar s test allows to compare two paired samples of binary data. In this essay, nonparametric techniques of correlation are described and explained with examples for. Home nonparametric tests nonparametric tests 2 related samples spss mcnemar test spss mcnemar test is a procedure for testing if the proportions of two dichotomous variables are equal in some population.