[R] Longitudinal data
ligges at statistik.tu-dortmund.de
Tue Dec 27 16:13:43 CET 2011
On 27.12.2011 14:43, Silvano wrote:
> I'm analyzing a longitudinal data set with 387 cows were observed in 63
> days divided into 6 groups, and every 30 days was found to produce milk.
> Does not aim to model the time using regression. Only compare the groups
> differ in terms of milk production. There are many missing observations.
> Because the data are correlated I used the SAS program:
> proc mixed data=univar method=reml;
> class RACA GRUPO APELIDO Dias;
> model Prod = GRUPO / solution DDFM=BW;
> repeated Dias / type=arh(1) subject=APELIDO r rcorr;
> lsmeans GRUPO / pdiff adjust=tukey;
> run ;
See package SASmixed that includes some nice examples how to move from
SAS to R.
> But, I want use R. What would be the equivalent in R?
> Thank you.
> Silvano Cesar da Costa
> Departamento de Estatística
> Universidade Estadual de Londrina
> Fone: 3371-4346
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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