Re: some help with a covariate please

Matt <matt.lewis2@xxxxxxxxx> wrote in news:516d811d-3181-4948-ac54-
bad19acd9542@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:


It is a fairly restricted age range (11-18 and only 1 person each is
11 and 18). Total n is 85

Number of subjects or number of test points?

So a plot for age shows that the trend to improvement over time is
the same, but the form of this is different.

With the age range so curtailed like this is it more sensible to use
age as a between subjects factor in the repeated measures analysis
rather than a covariate?

What is important is that you accurately describe the relationships in
your data. You say that the "form of [trend to improvement over time]
is different". I think you would get more sensible replies if you were
both more expansive and more specific about what you are seeing.

--
David Winsemius
.