Thanks for your help. I've got one other question. I have a number of observations sorted by a var1 and I want to find the median of var1 of these observations in a data step. I know I can do n=_n_; which will add the variable with the observation number. But then how can I get the middle observation (if the n is odd) or average the two middle observations (if the n is even). I'd like to assume in my code that I don't know the number of observations that exists in my data set.
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