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2010 Dec 15
3
selecting certain rows from data frame
Hi,
if I have a dataframe such that
ID Time Earn
1 1 10
1 2 50
1 3 68
2 1 40
2 2 78
2 4 88
3 1 50
3 2 60
3 3 98
4 1 33
4 2 48
4 4 58
.....
....
.....
Now if I have to select the all the rows from the data frame which does not