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Modelling growth by groups |
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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? Thanks, Eoin |
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I would agree with you. |
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