Re: [R] Treatment-response analysis along time

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.be>
Date: Wed 10 Aug 2005 - 17:21:25 EST

you haven't told us what kind of variable you measure, but either way look at lmer() function in lme4 package which fits both linear and generalized linear mixed-effects models.

I hope it helps.

Best,
Dimitris



Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


Dear R people,
I wonder if you could give me a hand with some of my data. I have a very
typical analysis in biology, however it is difficult for me to find the
right way to analyse. I had a group of animals, I gave them a treatment, and
I measure a variable along time -one´s per day- along 5 days,for example(fake data):
Animals Time1 Time2 Time3 Time4

1            1         5        3        1
2            2         7        4        1
3            5         5        3        1
4            1         3        7        2
5            2         7        7        1
Please, notice that all the animals get the same treatment, and there are no
  control -animals which has no received any treatment. Normally I handle this kind of data with SPSS and Repeated Measurement
analysis. That tell me if there is a change along the time, but no information about when the treatment start to be effective, when the effect
has pass. Besides, i would like to be able to handle this data with R. I have been looking at Crawley's S-plus book, and I cannot find similar
example as I have, not either in the Dalgaard´s introduction to R, because
he uses an example where different animals are measured as each time -using
time as a factor in a one way anova (I am hope I am right). Thanks for your help and time.
Best regards
Felix

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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Aug 10 17:27:46 2005

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