OK,
I have a data set that looks like this:
Day,Month,Year,Site,Species,1,2,3,4,5,6,7,100
23,3,2011,A,QUGA,0,2,5,9,1,0,3,1
24,3,2011,B,JUDE,3,5,6,8,3,9,4,5
So for every sample date (a row), 100 trees were measured (each row representing a single day at a single site). But the 100 trees...