Hello Niels, Thank you very much! Your solution was exactly what I needed.
(I didn't realize that "formula" has it's own environment - very useful!) Best, Tal ----------------Contact Details:------------------------------------------------------- Contact me: tal.gal...@gmail.com | 972-52-7275845 Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) | www.r-statistics.com (English) ---------------------------------------------------------------------------------------------- On Sun, Jan 30, 2011 at 11:35 AM, Niels Richard Hansen < niels.r.hansen+li...@math.ku.dk <niels.r.hansen%2bli...@math.ku.dk>> wrote: > e [[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.