I really need to sit down with the manual and sort factors and classes properly. In your case, I think the problem has something to do with the way a list behaves? I'm not sure, but if you convert your list to a dataframe it seems to work ok:
> dd3 <- as.data.frame(dd1) > typeof(dd3$st) [1] "integer" > class(dd3$st) [1] "factor" > dd3$st <- as.character(dd3$st) > typeof(dd3$st) [1] "character" > class(dd3$st) [1] "character" HTH, Tyler ______________________________________________ [email protected] 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.
