Hi, Say I have a following data
ID Week Event_Occurence A 1 0 A 2 0 A 3 1 A 4 0 B 1 1 B 2 0 B 3 0 B 4 1 that whether an individual experienced an event in a particular week. I wish to create list such as the first element of the list will be a vector listing the week number when the event has occurred for A, followed by that of B. Can you help creating this? -- Anindya Sankar Dey [[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.