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Re: GLM factorial analysis

From: Jason Stover
Subject: Re: GLM factorial analysis
Date: Tue, 16 Aug 2011 20:49:48 -0400
User-agent: Mutt/1.5.18 (2008-05-17)

On Sat, Aug 13, 2011 at 05:28:48PM +0000, John Darrington wrote:
> On Fri, Aug 12, 2011 at 05:37:20PM -0400, Jason Stover wrote:
>      I looked into this problem.  Briefly stated, this happens because the
>      meaning of "type 3 sums of squares" changes in the presence of
>      interactions.  The fix should be simple enough, but requires get_ssq
>      to know which variables, if any, went into an interaction. Is there an
>      easy way to do this?
> Yes.
> struct interaction which is defined in src/math/interaction.h is a transparent
> struct defined as follows:
> struct interaction
> {
>   size_t n_vars;
>   const struct variable **vars;
> };
> So it's easy to add a function which checks if a variable is a member of an 
> interaction. 

Interesting that I didn't know about this, because git log seems to say
I wrote much of it.


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