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var2
2009 Jun 17
2
cumulative sum in data frame
Dear R-Help List,
I have a question about data manipulation. I tried to make code myself but too much for me. I would greatly appreciate your help.
I have data set consisting of site (from 1 to N1) and distance and there are several variables (1 to N2) collected from each sampling site. I am interested in looking at cumulative sums of each variable based on site and distance like below.
Can