07-03-2013 06:53 AM
That is Uma did.
if not first.variable and last.variable;
You also can get duplicated obs by using the methods I mentioned before .
01-18-2014 03:05 PM
It is similar to Uma's incorrect application of #5. It identifies values of "variable" where there aren't any duplicates (i.e., if count is gt 1 then there were more than one record which had the same value of variable.
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