SPSS Mouse Sequence for SPLIT PLOT ANOVA with Repeated Measures Analyze GLM Repeated Measures Name the Within Subjects Factor (I usually use Time if there are separate measurement occasions). Enter the number of levels (3 in this case, it is the number of measurement occasions). Add Define Select the three variables (fall, winter, spring). Select the Between-Subjects Term (age group in this case). Plots Place Time on the Horizontal axis. Place (the between subjects variable, age group in this case) in the Separate Lines box. Add Continue Options Select descriptive statistics and the display all the means Continue OK