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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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