Dear List, I have data on a approximately 100 individuals visiting a a central logging station over a 1000 times. I would like to be able to calculate the distribution of inter-visit time intervals for all possible pairs am stuck on how to code for this. Single pairs are not a problem but extending it has been difficult for me. So for the toy data below I'd like to calculate for each 'a' how long until I see 'b' as well as for each 'b', how long until I see 'a' and so on for all possible pairs (2 triangle of a matrix?)
Thanks for any help, hints, and suggestions. Grant toy data: ind <- c('a', 'b', 'a', 'c', 'b', 'b', 'c', 'a', 'c') sec <- c(1, 3, 5, 6, 12, 22, 66, 85, 99) What I am looking for ab 2 [[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.