john james wrote: > Dear R-help mailing list, > � > Kindly help me out with this problem: > � > I have a dataset that is in the format below, > ID� time� Y� Age > 1� 0���� 195� 23.1 > 1� 2��� 204� 23.3 > 1� 4�� 202��� 23.5 > 2� 0� 170��� 22.0 > 2� 3�� 234�� 22.2 > 3� 0� 208�� 24.4 > 3� 2� 194� 24 .7 > 3� 3�� 204� 24.9 > � > I wish to remove all the measurements at time point 0 and convert�them to a > baseline variable as follows; > � > �ID� time� Y� Age� baseline > 1� 2��� 204� 23.3�� 195 > 1� 4�� 202��� 23.5�� 195 > 2� 3�� 234�� 22.2��� 170 > 3� 2� 194� 24 .7���� 208 > 3� 3�� 204� 24.9���� 208 > Something in your mail path (or mine) is inserting funny characters in your text, making it a bit hard to use the data for testing...
Anyways, I'd split the data frame into the baseline values and the rest using subset() or maybe split(), rename the baseline variable(s) and then stick things together with merge() -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ 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.
