search for: rammday

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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...