02-04-2014 07:44 AM
I have a dataset and sorted it by five variables. One of these variables is named "DIFF". Now I would like to delete all the groups of observations, as long as one of the DIFF equals 0. (Deleting the observations with DIFF equals 0 is simple, but i would to delete the whole group as long as one of the observations has DIFF=0).
I would be very grateful for any help!