Jeffrey and Jeff, Thank you for clearing this up.
The problem was that I didn't read page 47 of the guide carefully. The introduction of the <<- operator on page 44 leaves me with the impression that <<- will create an assignment in the local environment THAT ALSO holds true for the next higher environment. Joe Boyer Statistical Sciences Renaissance Bldg 510, 3233-D Mail Stop RN0320 8-275-3661 cell: (610) 209-8531 [[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.