Thank you Adrian. Its working.Thank you so much. Take care =^D=) Cheers
Arup Pramanik Business Analyst Redwood Associates Bangalore,India. Adrian Dusa wrote: > > On Tuesday 24 March 2009, you wrote: >> Hello!I am having a problem with Random sampling in R. I have used a >> syntax: mydata.sub=sample(mydata,7,replace=FALSE,prob=NULL) which allows >> me >> to choose a random sample based on the variables(correct me if I am >> wrong!). > > Actually, no. > You are sampling from a vector, and where you're using the sampled values > (on > the rows or on the variables) is up to you. > > Let's say we have a dataset with 100 cases and 10 variables: > > Case 1: > mydata.sub <- mydata[ , sample(10, 7)] > > This will sample 7 variables out of 10. > > Case 2: > mydata.sub <- mydata[sample(100, 10), ] > > This will sample 10 cases out of 100. > >> Suppose I have 10 variable and if I use the above mentioned >> command then it will choose 7 variables out of the 10 randomly. My >> problem >> is that I want to have a random sample which is not based on the >> variables >> but on the values of the variables that is the random sample will be >> based >> on the observations. It will be great if someone can help me out me out >> with >> a proper syntax. Thanks in Advance. > > I think you need to read the help for: > ?"[" > > and most probably one of the introductory books for R. > I hope this helps, > Adrian > > > -- > Adrian Dusa > Romanian Social Data Archive > 1, Schitu Magureanu Bd. > 050025 Bucharest sector 5 > Romania > Tel.:+40 21 3126618 \ > +40 21 3120210 / int.101 > Fax: +40 21 3158391 > > > [[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. > > -- View this message in context: http://www.nabble.com/Random-sampling-based-on-the-observations-tp22673975p22681075.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.
