Two-way Repeated Measures Analysis of Variance Using SPSS

Two-way Repeated Measures Analysis of Variance Using SPSS 

Overview: The instructions on this sheet cover two procedures: 
1. A one-way within-subjects ANOVA, used when you have one independent variable and one group of subjects measured repeatedly under 3 or more conditions. For example, subjects are measured in a baseline condition, are given a treatment, and are followed up at 3 later points in time. 
2. A 2-way mixed ANOVA, used when you have two independent variables with one within-subjects factor, and one between-subjects factor. The within-subjects factor is the repeated measures factor. On the between-subjects factor, subjects are divided into discrete subgroups, and each subject falls into only one of those subgroups.
To run: From the Data Editor Window 
Click on "Analyze" 
Click on "General Linear Model" 
Click on "Repeated Measures"

The following dialog box will appear:

Begin with the repeated measures factor. The first thing you need to do is to instruct SPSS to treat your repeated measurements not as different variables, but as different levels of the same variable. To do this click the box "Within-Subject Factor Name" and type in a name for your repeated measures variable.

Type in the number of observations you have on each subject in the box labeled, "Number of Levels" 
Click on "Add". The name of your new variable will appear in the box with the number of levels of that variable in parentheses.

Click on "Define" 
The following GLM - Repeated Measures dialog box will appear:

You must now tell SPSS what the different levels of your repeated measures factor are, that is, which variables from the column on the left represent your different levels. Click on each of the variables, i.e. baseline, time2, time3, time4 and click the right arrow key to move those variables to the box labeled, "Within-subjects Variables"

If you are running a one-way repeated measures ANOVA, you are done. 
Click "OK"

If you are running a two-way mixed ANOVA you need to indicate which variable is your between subjects variable. Click on that variable from the column on the left and click the right arrow to move it to the box on the right labeled, "Between-Subjects Factor(s):"

Click on "OK"

Output:

One-way repeated measures ANOVA 
The first table you see lists "Descriptive Statistics" for each of your groups, i.e., mean, standard deviation, and sample size. Note the sample size will be identical for all groups because the same subjects appear in each group.

Look at the table, "Tests of within-subjects effects." 
The first line of this table gives you your F, its degrees of freedom, and the probability of your F.

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