Group effects EMA [Two-Stage / GS Designs]

posted by ElMaestro  – Belgium?, 2014-10-01 11:31  – Posting: # 13630
Views: 30,681

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.

Le tits now.

Best regards,
ElMaestro

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