Dear list I have a question, I would like to get the following results but I dont know how to do it: I have a dataframe like this:
NC8 PROD X 1 X2 1423 P1 342 10 1564 G5 56 20 123 G5 3 4 1568 H2 6 10 7864 H2 5 72 5693 P3 7 43 What I would like to do is the sum of the X1 and X2 variables by PROD, namely getting another dataframe which looks like the following NC8 PROD X 1 X2 1423 P1 342 10 1564 G5 59 24 123 G5 59 24 1568 H2 11 82 7864 H2 11 82 5693 P3 7 43 In Sas I know a function called proc means that can do it. How can I do this in R??? ______________________________________________ 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.
