Thank you very much, folks. I had read the paper "Introduction to R" but sometimes I had problems with the examples. Now I can solve all my problems with the help of your ideas.
Thanks, Corinna ______________________________________________ R-help@stat.math.ethz.ch 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.
