Re: [R] mixed model fitting between R and SAS

rg" Cc: Sent: Monday, August 8, 2011 1:19 AM Subject: RE: [R] mixed model fitting between R and SAS Please don't cross-post. - corAR1() models the correlation between the residuals of the two time points. - if you want a specific correlation structure for biopsy locations the you mus

[R] 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 tre