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Dear Karl,

Thank you for the rapid reply.

> > Secondly when I put the covariate in as "specific fit" it then asks for
> > 11 items in each contrast vector.  (I assume because I have 11
> > subjects).  I entered 2 contrasts, 1 1 1 1 1 1 1 1 1 1 1 and -1 -1 -1
> > -1 -1 -1 -1 -1 -1 -1 -1, again is this reasonable?
>
> Yes it is. These contrasts will give you the average regression slopes
> over subjects.  Note you can also test for differences among subjects
> (i.e. subject x VAS interactions) with the appropriate contrasts using
> this model.
>

This rather wetted my appetite.  I would be interested to know more about
what you meant by this interaction, and how to do it.

Regards,

Mark



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