Re: comparing slopes for significant difference

From: Scott Seidman (namdiesttocs_at_mindspring.com)
Date: 03/11/05 

Date: 11 Mar 2005 17:20:52 GMT

Ben <benjamin.kenward@zoology.ox.ac.uk> wrote in
news:Xns961691E1DBB21benjaminkenwardzoolo@163.1.2.7:

> Unfortunately there is a
> complication. One of the individuals is missing a lot of data at the
> start of the period, which causes its regression line not to pass
> through the origin (and therefore creates an artifactual significant
> difference). For this particular parameter, it should by nature have
> value 0 at time 0 (and the intercepts of the regression for the other
> individuals do go pretty much right through 0).

Why don't you run a zero-intercept model, if you have reason and
justification to do so?

Scott

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