Hi r-help-boun...@r-project.org napsal dne 01.04.2009 11:16:26:
> Hello, > > A nice guy call Jun Shen was helping me out with this, but I require a bit > more help. Below is my data set or list called 'test'. I'm trying to calculate > the %RSD for each pair of index and keep it in cronological order if you can > imagine a 3rd column with 'date' beside index. > > Result Index > 1 0.2901 17 > 2 0.2928 17 > 3 0.2913 18 > 4 0.2893 18 > 5 0.3526 9 > 6 0.3316 9 > 7 0.3492 10 > 8 0.3467 10 > 9 0.3385 11 > 10 0.3341 11 > 11 0.3449 12 > 12 0.3406 12 > 13 0.3690 13 > 14 0.3327 13 > 15 0.3324 14 > 16 0.3245 14 > 17 0.3245 15 > 18 0.3229 15 > 19 0.3331 16 > 20 0.3208 16 > > > now this bit of programming works for it how ever it puts the mean of my index > back into numeric order. > > aggregate(test[1],test[2],mean)->inter > names(inter)[2]='mean' > merge(test,inter,all=T)->inter2 > inter2$RSV=inter2$Result/inter2$mean > ?ave was also recommended and for your case it is strightforward test$mean<-ave(test$Result, test$Index) test$RSV<-test$Result/test$mean Regards Petr > Would anyone know away around this so I could keep the data in cronological order? > > Kind Regards, > Al > > > [[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. ______________________________________________ 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.
