Displaying 1 result from an estimated 1 matches for "biopsysite".
2011 Aug 08
1
mixed model fitting between R and SAS
...locations? How do I specify a particular correlation structure for between biopsy locations in this situation?
Second, does anyone know how to write the above mixed model in SAS? One of my colleagues wrote the following, but it gave me different results:
proc mixed data=test;
class time trt pid biopsysite;
model y=age time trt time*trt;
random biopsysite
repeated pid / type=ar(1)
run;
Is there anyone familiar with SAS and know if the above SAS code does what the R code does?
Many thanks
John
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