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Mplus Discussion > Growth Modeling of Longitudinal Data >
 Joyce Weeland posted on Monday, February 23, 2015 - 12:36 am
For analysis of an intervention effect (RCT) I am using a LGM with different moderators that might affect the slope. One of these is number of sessions a participant attended, which is 0 for all participants in the control condition. Therefore I used "condition" ad grouping variable and specified the model for both groups separately: not using the number of sessions in the control group. However, I still get this error when I try to run the syntax:
One or more variables have a variance of zero.
Check your data and format statement.

Maybe I am overlooking something.
Thank you in advance for your help.
 Linda K. Muthen posted on Monday, February 23, 2015 - 9:46 am
Please send your output and license number to
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