I have a data set similar to this:

P1id    Veg1    Veg2    AreaPoly2       P2ID
1       p       p       1               1
1       p       p       1.5             2
2       p       p       2               3
2       p       h       3.5             4

For each group of "Poly1id" records, I wish to output (subset) the record 
which has largest "AreaPoly2" value, but only if Veg1=Veg2. For this 
example, the desired dataset would be

P1id    Veg1    Veg2    AreaPoly2       P2ID
1       p       p       1.5             2
2       p       p       2               3
 
Can anyone point me in the right direction on this?

Dr. Seth  W. Bigelow
Biologist, USDA-FS Pacific Southwest Research Station
1731 Research Park Drive, Davis California
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