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| Unstable mean number of visits |
 
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Dear Professors, we are running a twolevel growth model for three visits (coded 0, 1, and 2). Thus, the mean of visits cannot be greater than 1.0.
When we run the unconditional growth model:
ANALYSIS: TYPE IS TWOLEVEL RANDOM;
MODEL: %WITHIN%
s | WTAR ON Visit;
%BETWEEN%
WTAR WITH s;
The mean of Visit is 0.872.
When I add a single covariate (age zeroed (youngest participants is aged 0):
MODEL: %WITHIN%
s | WTAR ON Visit;
%BETWEEN%
WTAR s ON Age_zero;
I get a mean of visits of 1.7.
Since this is not possible, and my data are the same for both models, I am confused as to how or why this has happened.
Thank you, for your assistance.
Romola |
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When you say "mean of Visit", do you mean "mean of s"?
If not, send the 2 outputs and data to Support along with your license number. |
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