Hi, Try this:
dat1<-data.frame(var1=15:25) dat1$var2<-NA dat1$var2[2:11]<-dat1$var1[1:10] dat1 var1 var2 1 15 NA 2 16 15 3 17 16 4 18 17 5 19 18 6 20 19 7 21 20 8 22 21 9 23 22 10 24 23 11 25 24 You can also do the same within the single variable. e.g. dat1$var1[6:10]<-dat1$var[5:9] A.K. ----- Original Message ----- From: Ernie Tedeschi <ernie.tedes...@gmail.com> To: r-help@r-project.org Cc: Sent: Saturday, July 7, 2012 11:20 PM Subject: [R] Notation for previous observation in a data frame I've created a data frame in R, but in order to clean up some of the data, I need to set certain variable observations equal to the value of their previous observation (it would be conditional, but that part's less important right now). In Stata, I would simply set var = var[_n-1] in those cases. What is the R equivalent? [[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.
