If I understood correctly, the initial post asked for a vector of the same length as the original one. This is why I suggested:
tapply(Measure,Month,mean)[as.character(Month)] btw, this is handy way to compute deviations from the means of subgroups (x - tapply(x, group, mean)[as.character(group)]) Christophe Pallier On 5/22/07, John Kane <[EMAIL PROTECTED]> wrote: > > aggregate(Measure, list(Month=Month), mean) > > --- Benoit Chemineau <[EMAIL PROTECTED]> > wrote: > > > Hello, > > I have a basic problem but i can't figure it out > > with the > > table underneath. I would like to compute monthly > > averages. > > I would like to have the average measure for > > month #5 for the first > > three rows (the same number in the first three > > lines) and the average > > measure for month #6 for the last four rows ((the > > same number in the first > > three lines) in a separate vesctor (let's call it > > 'result') > > I tried to use a "while" statement inside a "for" > > loop but it doesn't > > seem to work. > > Can someone please help me with this ? > > > > Measure Month > > 2.28 5 > > 14.04 5 > > 0.60 5 > > 0.21 6 > > 0.96 6 > > 0.75 6 > > 1.28 6 > > > > Thank you ! > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@stat.math.ethz.ch 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. > > > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > -- Christophe Pallier (http://www.pallier.org) [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch 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.