Dear R users I wonder if there is a quick way to calculate the ratio/fraction of a list/data frame. For example, if I have a data frame with two fields: "Index" and "A". I would like to know the fractions of A's within the same "Index". That is, for Index =1, three fractions will be "1/(1+2+3)=0.17", "2/(1+2+3)=0.33", and "3/1+2+3=0.5". Likewise for Index =2 and Index 3. So, I then generate a new vector of 0.17, 0.33, 0.5... ,etc.
Index A 1 1 1 2 1 3 2 4 2 3 3 7 3 9 3 3 3 1 Thank you so much Yihsu [[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.