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32819
2011 Aug 08
1
mixed model fitting between R and SAS
Hi al,
I have a dataset (see attached), which basically involves 4 treatments for a chemotherapy drug. Samples were taken from 2 biopsy locations, and biopsy were taken at 2 time points. So each subject has 4 data points (from 2 biopsy locations and 2 time points). The objective is to study treatment difference.?
I used lme to fit a mixed model that uses "biopsy.site nested within pid"