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R language dplyr package select function, group_ By function, mutate function and cumsum function calculate the cumulative value of the specified numerical variable in the dataframe grouping data and
2022-07-05 14:10:00 【statistics. insight】
R Language dplyr package select function 、group_by function 、mutate function 、cumsum Function calculation dataframe The cumulative value of the specified numeric variable in the grouped data 、 And generate cumulative data columns
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