Hi,
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 ;
But, I want use R. What would be the equivalent in R?
Thank you.
--------------------------------------
Silvano Cesar da Costa
Departamento de EstatÃstica
Universidade Estadual de Londrina
Fone: 3371-4346
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