Q&A: Entering one-way ANOVA data

Is it possible to define the groups with a grouping variable?

No. The groups must be defined by columns. Enter data for one group into column A, another group into column B, etc..

Can I enter data in lots of columns and then choose which to include in the ANOVA?

Yes. After you click Analyze, you'll see a list of all data sets on the right side of the dialog. Select the ones you wish to compare.

Can I enter data as mean, SD (or SEM) and N?

Yes. Follow this example to see how. It is impossible to run repeated measures ANOVA or a nonparametric test from data entered as mean, SD (or SEM) and N. You can only choose an ordinary one-way ANOVA.