Hi, I have got a problem with dummy coding and I really couldn't figure it out. Would you please help me out? this is my codes:
idx<-sort(unique(Employment.time$V1)); dummy <- matrix(NA, nrow=nrow(Employment.time), ncol= length(idx)) for (i in 1:nrow(Employment.time)) { for (j in 1:length(idx)) { if (Employment.time$V1[i,j] == "Over 4 years") { dummy[i,j] <- 0 } else { dummy[i,j] <- 1 } } } but the R shows that Error in `[.default`(Employment.time$V1, i, j) : incorrect number of dimensions Do you know where is wrong? many thanks! [[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.