Here is an R problem I am struggling with: My dataset is organized like this...
subject session variable_x variable_y 01 1 1 <interger values> 01 1 2 01 1 3 01 2 1 01 2 2 01 2 3 02 1 1 02 1 2 02 1 3 02 2 1 02 2 2 02 2 3 03 1 1 03 1 2 03 1 3 03 2 1 03 2 2 03 2 3 ... I need to find the level of variable x at which variable y has the maximum value for each individual for each session. Then, I need to create another variable, say variable "z" that labels that row in the dataset as the "max" for that individual at that time. I have searched the archives and the web for ideas, but am having trouble finding appropriate search terms for what I need to do. Any advice? Thank you!! [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.