Many thanks, your solutions solve a number of my problems (not least weening myself off SAS)
Best wishes, Peter _________________________ Peter James Lee Assistant Professor Psikoloji Bölümü Bilkent University Bilkent Ankara Turkey 06800 e-mail: [EMAIL PROTECTED] office: (90) 312 290 1807 home: (90) 312 290 3447 website: http://www.bilkent.edu.tr/~peterjl/index.html ______________________________________________ [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.
