Re: interpretting F & t-vals from regression

On Thu, 23 Mar 2006 20:54:56 +0000, Rob Campbell wrote:

Br
lme(outcome ~ intensity + duration + intensity *
duration,data=X, random=~duration|subject/duration )

That model doesn't work. lme hangs. I do this:

lme(mue ~ duration/level, random=~1|animal/duration))

The results are as you say below but without the main effect of
intensity and with an intensity:duration40 interaction.

Rob,

Clearly, I messed up the specification of the random part, you have
corrected it as =~1|animal/duration

I think you want the interaction of duration and intensity, using whatever
your variable names are for intensity * duration. Again, something like:

lme(mue ~ intensity * duration, random=~1|animal/duration)

Note using "intensity * duration" in your model, R should put any lower
order terms in automatically, though I specified them explicitly before.

Also, check the setup of the factor duration with levels(duration) and
make sure the ordering is correct.

Anything further, I would take to the R list, where people with much more
expertise with lme than I hang out.

Brett



.

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