Hello all, I have been meaning to learn R for a while and have just subscribed to this list. I am planning to give R a shot at one of my live projects. I am looking to explore graphical features of R on my data below. Sample Data: Cat1 - Cat2 - Cat3 - Cat4 - NumPeople - Salary H - L - H - L - 100 - 50000 L - L - L - L - 40 - 30000 - H - H - - 100 - 45000 Cat1 through Cat4 are categorical variables containing High, Medium, Low or Blank values and the last two variables are continuous. 1. Is there a good way of graphically representing this data in R? I am looking for total population and average salary within each combination of values. 2. Cat1 and Cat2 are related while Cat3, Cat4 are related. I have a grid in Excel that summarizes by having (Cat1 + Cat2) on the left and (Cat3 + Cat4) on the top. Could we draw this kind of matrix using R? I started looking up this morning and see that this could be done using trellis objects. I will appreciate if anyone has examples similar to this. Thanks, [[alternative HTML version deleted]]