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rammday
2010 Mar 31
2
Summing data based on certain conditions
Dear all,
I have a dataset of 1073 rows, the first 15 which look as follows:
> data[1:15,]
??????? date year month day rammday thmmday
1?? 3/8/1988 1988???? 3?? 8??? 1.43??? 0.94
2? 3/15/1988 1988???? 3? 15??? 2.86??? 0.66
3? 3/22/1988 1988???? 3? 22??? 5.06??? 3.43
4? 3/29/1988 1988???? 3? 29?? 18.76?? 10.93
5?? 4/5/1988 1988???? 4?? 5??? 4.49??? 2.70
6? 4/12/1988 1988???? 4? 12??? 8.57??? 4.59
7? 4/16/1988 1988???? 4? 16?? 31.18...