Psychology and Statistics department at Stanford University.  This non-parametric (distribution-free) test assesses if a statistically significant change in proportions have occurred on a dichotomous trait at two time points on the same population.   It is applied using a 2×2 contingency table with the dichotomous variable at time 1 and time 2.  In medical research, if a researcher wants to determine … Continue reading McNemar’s Test