Hello all, I've been trying to do the following analysis. I have a table (T1) that defines sizes of my datasets (~80k rows): size X1 1000 X2 8323 X3 58 And then I have a table (T2) of ~ 5 million significant overlaps between datasets: X234 X443 X323 X1 X998 X12 What I want to do, is split table T1 into 10 quantiles by "size", which I seem to successfully achieve using these commands: qq <- factor(cut(T1$size,quantile(T1$size, probs=seq(0.0,1.0,by=0.1)),include.lowest = TRUE),labels = LETTERS[1:10]) table(qq) A B C D E F G H I J 8204 7643 7941 7878 7867 7773 7913 7856 7894 7869 Now I need to count how many of all 100 possible combinations (AA,AB,AC,etc) are present in table T2 using these factors. How can I do that? Thank you in advance, -- Alex [[alternative HTML version deleted]]