Re: GLM factorial analysis

[Jason Stover]

On Tue, Aug 16, 2011 at 08:49:48PM -0400, Jason Stover wrote:
> 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.

...but then I noticed you rewrote it...