Thanks however it is not working for me. I get this log: 643 644 data thesis.rank_ndC; 645 set thesis.rank_ndd NOBS=COUNT; 646 647 if NOBS - _n_ < 6 then delete; 648 run; NOTE: Variable NOBS is uninitialized. NOTE: Missing values were generated as a result of performing an operation on missing values. Each place is given by: (Number of times) at (Line):(Column). 25 at 647:9 NOTE: There were 25 observations read from the data set THESIS.RANK_NDD. NOTE: The data set THESIS.RANK_NDC has 0 observations and 11 variables.
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