>
> Both methods work with my main test data (the source of 111 X and 10 Y), 
> yielding 9 runs that match both.  The alias method, however, let a 
> duplicate row sneak in.  I need to test more pairs, but I think you 
> (Anthony) solved my problem.
>

If the alias method is producing duplicates, I'm guessing the run in 
question has the same waypoint repeated more than once. Just set 
distinct=True to remove the duplicates.
 

>
> BTW, can one do a groupby inappadmin/select?
>

I don't think so.

Anthony

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