Displaying 1 result from an estimated 1 matches for "poly1id".
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poly1
2009 Dec 29
4
subsetting by groups, with conditions
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...