Serdal, I think what David is saying: just take those 2 variables you have and specify them as factors. Assuming your data frame is called "MyData":
MyData$Ind_1<-as.factor(MyData$Ind_1) MyData$Ind_2<-as.factor(MyData$Ind_2) This way R will know they are not numeric variables but categorical variables. Then, when you do analyses using those variables, R will treat them as such and will build dummies "automatically" (e.g., if you use regression, etc.). Actually - it'd be nice to know what you are building your dummies for. Dimitri On Fri, Apr 23, 2010 at 11:34 AM, David Winsemius <dwinsem...@comcast.net> wrote: > > On Apr 23, 2010, at 11:26 AM, serdal ozusaglam wrote: > >> >> Dear R users, >> >> I have a simple question (probably) but i couldnt how to find a solution >> for that. >> >> i am using 2 digit industry codes and 3 digit industry codes for my model, >> and i need to create dummies for the industries. The case is simple for the >> 2-digit industries since there are not that mcuh of them, so i am creating >> my dummies as following >> ind_2da<-(ind_2d==11)#for the 11th industry >> ind_2dc<-(ind_2d==12)#for the 12th industry and so on so forth ... then i >> directly put the dummy into the regression which works well. >> >> but creating dummies for the 3-digit is rather complicated since there are >> alot of sub-industries, for example:111,112,113...119 and this is just for >> the 11th industry >> so when i consider the codes continues till 40, it would be exhausting to >> do it by hand. >> >> so i was looking for the loop commands to do it faster but since i am a >> newbie i got lost in it. >> >> so is there some one who can help me for this problem? > > Don't use dummies. > > ?factor > >> > -- > > David Winsemius, MD > West Hartford, CT > > ______________________________________________ > 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. > -- Dimitri Liakhovitski Ninah.com dimitri.liakhovit...@ninah.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.
