Well, it should be difference by ID and TIME for q1: something like: for ID 1187 in TIME 1 q1=3 and TIME 2 (for same ID) q1=3 so diff would be 3-3=0
TIME ID q1 1 1187 3 1 1187 3 And I don't know how to make R to find pairs and calculate diff? 2011/2/21 Dennis Murphy <djmu...@gmail.com> > Hi: > > Assuming dd is the name of your data frame, > > > dd$diff <- with(dd, q2 - q1) > > dd > TIME ID q1 q2 diff > 1 1 1187 3 2 -1 > 2 1 1706 3 3 0 > > 3 1 1741 2 4 2 > 4 2 1187 3 2 -1 > 5 2 1706 3 3 0 > 6 2 1741 2 4 2 > > is one way to do it. > > HTH, > Dennis > > On Mon, Feb 21, 2011 at 11:05 AM, Vlatka Matkovic Puljic < > v.matkovic.pul...@gmail.com> wrote: > >> Dear all, >> >> I want to perform paired Wilcoxon signed ranks test on my data. >> I have pairs defined by ID and TIME variables. >> >> How can I calculate difference in variables q1, q2 in each pair? >> >> TIME ID q1 q2 >> 1 1187 3 2 >> 1 1706 3 3 >> 1 1741 2 4 >> 2 1187 3 2 >> 2 1706 3 3 >> 2 1741 2 4 >> >> Please, any clue! >> :) >> >> >> -- >> ************************** >> Vlatka Matkovic Puljic >> +32/ 485/ 453340 >> >> [[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. >> > > -- ************************** Vlatka Matkovic Puljic +32/ 485/ 453340 [[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.
