To someone who may concern, I want to continue the submission. of r-help list.
Thanks a lot! Chen -- Best Regards, Yours, Chen He PhD Candidate Institute of Population Research Peking University, Beijing, China [[alternative HTML version deleted]] ______________________________________________ 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.