Group effects EMA [Two-Stage / GS Designs]

posted by ElMaestro  – Belgium?, 2014-10-01 11:31  – Posting: # 13630
Views: 30,349

Hi Mittyri,

» More effects in model mean wider intervals.
» Please correct me if I'm wrong.

That's kind of incorrect.
The more effects you have in your model, the more variation is accounted for by the totality of terms; the residual will decrease as will be residual's degrees of freedom. Therefore the width of the CI tends to shrink.

It may happen that the inclusion of a term apparently does nothing. This is due to the design where some effect may contain the other; in such situation the residual variance, the residual df and the width of the CI remain unaffected. But you will never see the CI widened due to more factors.

I could be wrong, but...
Best regards,

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