I would suggest what we already suggested to you: ?aggregate ?by ?doBy::summaryBy
We could help you more precisely if you could provide a reproducible example, as explained in the posting guide (see link at the end of every email from this list)
Ivan Le 12/13/2010 15:14, effeesse a écrit :
I am sorry, but I cannot understand how to use the "summary" function. Maybe, if I describe my needs, you could sketch a line that could work. In the data set variable "V" can take values 1 to 14. For the subgroup of individuals where "V" takes value =1 I want the mean and variance of a certain set of other variables (V1, V2, V3, V4, V5). And this for all the other subgroups for values 2 to 14. What do you suggest?
-- Ivan CALANDRA PhD Student University of Hamburg Biozentrum Grindel und Zoologisches Museum Abt. Säugetiere Martin-Luther-King-Platz 3 D-20146 Hamburg, GERMANY +49(0)40 42838 6231 ivan.calan...@uni-hamburg.de ______________________________________________ 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.
