Hi, Look at the table() function. Here is an example with your data:
dat <- read.table(textConnection(" Study A A B B B A C C D"), header = TRUE) closeAllConnections() table(dat) Hope that helps, Josh On Fri, Sep 10, 2010 at 8:53 AM, dfong <df...@medicine.umaryland.edu> wrote: > > Hi, > > I just started using R and need some guidance. > > I need to create a time series chart in R, but the problem is the data is > not numeric. > The data is in the following format > > Study > A > A > B > B > B > A > C > C > D > > Then there is also another column with dates. How can I manipulate this in > order to have something that will count the number of unique entries and > group them. > Say A = 3 B= 3 C=2 D=1 > > Thanks > -- > View this message in context: > http://r.789695.n4.nabble.com/Data-Manipulation-tp2534662p2534662.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. > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.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.