Are you sure that you want to loop over variables for each subset, and do this within each subset? A simple way to generate summary statistics (across variables and within categories) is the summaryBy function in the doBy package:
d=data.frame(wt=rnorm(100,100,10),ht=rnorm(100,2,1),sex=gl(2,1,100)) library(doBy) summaryBy(wt+ht~sex,da=d,FUN=c(mean,sd)) David Freedman SNN wrote: > > > Hi, > > This is just for print out so it looks nice. what I have is a loop that > loops over my variables and calculates the mean and the sd for these > variables. Then I need to rbind them so I can stack them up in one file. > the problem is that only the fist header appears and the rest do not. this > is because I used rbind. > > I am new into R , can you tell me how you put them in a 'list'?. > > Thanks > > > > > jholtman wrote: >> >> What do you want to do with it? Is this just for printing out? What >> other types of transformations are you intending to do? Why not just >> put them in a 'list' and then write your own specialized print >> routine. >> >> On Wed, Jan 21, 2009 at 10:30 AM, SNN <s.nan...@yahoo.com> wrote: >>> >>> Hi, >>> >>> I need to rbind two data frames. Each one has a header . after the rbind >>> I >>> would like to keep the header for each and have the two data frames >>> separated by a line. Is this possible to do in R? >>> >>> For example >>> >>> weight_mean weight_sd.dev >>>> F 14.33333 4.932883 >>>> M 34.66667 10.692677 >>>> >>>> hight_mean hight_sd.dev >>>> F 35.00000 7.071068 >>>> M 34.66667 10.692677 >>> >>> >>> -- >>> View this message in context: >>> http://www.nabble.com/should-I-use-rbind-in-my-example--tp21585464p21585464.html >>> Sent from the R help mailing list archive at Nabble.com. >>> >>> ______________________________________________ >>> 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. >>> >> >> >> >> -- >> Jim Holtman >> Cincinnati, OH >> +1 513 646 9390 >> >> What is the problem that you are trying to solve? >> >> ______________________________________________ >> 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. >> >> > > -- View this message in context: http://www.nabble.com/should-I-use-rbind-in-my-example--tp21585464p21590200.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
