ONKELINX, Thierry inbo.be> writes:
> With t*treat the model allows for a different slope AND a different
> intercept for each treatment. If you only want different slopes and all
> intercepts equal to 0, then t:treat - 1 or t + t:treat - 1 is the model
> you are looking for.
Thanks Thierry and C
Hi Dieter,
the following model assumes a linear relationship between the response
"newbone" and the
independent variable "t" with a common intercept equal to 0 and
treatment-dependent slopes:
grd.lme0 <- lme(newbone~t:treat-1, data=grd, random=~1|subject)
summary(grd.lme0)
Christian
Verzonden: woensdag 1 april 2009 14:11
Aan: r-h...@stat.math.ethz.ch
Onderwerp: [R] How to prevent inclusion of intercept in lme with
interaction
Dear friends of lme,
After so many year with lme, I feel ashamed that I cannot get this to
work.
Maybe it's a syntax problem, but possibly a la
Dear friends of lme,
After so many year with lme, I feel ashamed that I cannot get this to work.
Maybe it's a syntax problem, but possibly a lack of understanding.
We have growth curves of new dental bone that can well be modeled by a
linear growth curve, for two different treatments and several
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