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st: interaction in anova # or ##
From
"Pesola, Francesca" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: interaction in anova # or ##
Date
Mon, 25 Nov 2013 16:03:02 +0000
Hi All,
I am running some analysis on RCT data to see whether depression scores at follow-up, while adjusting for baseline scores, depend on allocation group (control vs. treatment).
As a secondary step I am interested to see if the effect of group depends on age and gender of participants in my sample, as suggested by the literature. However, I am not sure which way of including the interaction term is 'more correct' based on my aims, whether to use:
anova followup group##c.age c.baseline; or
anova followup group#c.age c.baseline
Grateful for suggestions,
Francesca
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