As Jim suggested, the duplicated() function should help. If I understand what you're after, you could try something like this. I assumed that the name of your data frame was "df".
selrows <- df$WorkerID %in% df$WorkerID[duplicated(df$WorkerID)] # SubjectNumbers with duplicate WorkerIDs df$SubjectNumber[selrows] # Full records with duplicate WorkerIDs df[selrows, ] Jean jim holtman wrote on 09/21/2011 10:13:49 PM: > > ?duplicated > > Hard to give a specific solution unless you follow the posting guide > and provide a subset of the data to test on. > > On Wed, Sep 21, 2011 at 7:31 PM, stevesp101 <sanpietro.st...@gmail.com> wrote: > > Hi, > > > > I'm trying to find out if there is a command that tells me which cells in my > > data frame have the same value. I am looking at the results from an online > > survey, organized into a data frame with the following columns: > > SubjectNumber, WorkerID, Age. I know the one person must have taken the > > survey more than once, because there is one less level in the WorkerID > > column than there are rows in the data frame. Is there something that will > > tell me which SubjectNumber cells correspond to more than one WorkerID cell? > > Thanks, > > > > Stevesp > > > > -- > Jim Holtman > Data Munger Guru > > What is the problem that you are trying to solve? [[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.