Hi, I have imported a csv file into R which contains one column (the rate er 100,000 population of a disease, by month over 11 years) I coerced into a time series using the following function, tstkr<-ts(tkr,deltat=1/12) This seems to work fine, and when I check for the class of the object using class(tstkr) I get "ts" as the response. When I try to use the stl function in stats I get the error message: Error in stl(tstkr)only univariate series are allowed I then tried this: tstkr <- ts(c(tkr), deltat=1/12) however this made no difference...I still get an error - does anybody know what is wrong? Regards, Daniel