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. > [[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.
