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2.3. COMPARING TWO GROUPS
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After you have made a selection for N levels:, the Y variable window expands
to allow you to specify the variable(s) containing identification codes for units
at each level:
• From the drop-down list labelled level 1(i):, select student
• Click done
Note that level 1 corresponds to the level at which the response measurements were made.
The Equations window now looks like this:
Now we need to add the gender variable:
• Click the Add Term button
This brings up the following window:
This window allows you to add continuous and categorical variables and
higher level interactions between variables. To add the gender variable:
• Select girl from the drop-down list labelled variable
• Click Done
The Equations window will now look like this: