Sorry to bother your. I am trying to post my question for more than 10 times, but I still didn't see it. It drives my crazy!!!
It is a test for posting some simple pure text. Chao ______________________________________________ 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.
