Modelling growth by groups PreviousNext
Mplus Discussion > Multilevel Data/Complex Sample >
 Eoin O'Connell posted on Wednesday, September 02, 2009 - 1:53 am
I have an intervention that is intended to reduce sedentary behaviour. I'm testing the experimental and control groups at four times (baseline, post-intervention 9 months later, 6 month follow-up and 12 month follow up).

Some examples that I have seen of similar analyses regress the intercept and slope values on group. But I can't see why you would regress the intercept when it's a baseline value. As far as I can see, group membership should only affect the slope value.

iSED sSED | sed1@0 sed2@0.75 sed3@1.25 sed4@1.75
sSED ON IntGrp

My model is a bit more complex but this is roughly what I mean.

What's your opinion?

 Linda K. Muthen posted on Wednesday, September 02, 2009 - 8:40 am
I would agree with you.
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