[R] Looking for easy way to normalize data by groups

Hi, i do have a dataframe representing data from a repeated experiment. PID is a subject identifier, Time are timepoints in an experiment which was repeated twice. For each subject and all three timepoints there are 2 sets of four values. df - data.frame(PID = c(rep(A, 12), rep(B, 12),

Re: [R] Looking for easy way to normalize data by groups

On Mon, Jun 8, 2009 at 10:29 AM, Herbert Jägleherbert.jae...@uni-tuebingen.de wrote: Hi, i do have a dataframe representing data from a repeated experiment. PID is a subject identifier, Time are timepoints in an experiment which was repeated twice. For each subject and all three timepoints