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如何使用group_by语句在R中执行逐行除法?

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I have the following data-frame

我有以下数据框架

Year    Category      TotalSales    AverageCount
1   2013    Beverages      102074.29    22190.06
2   2013    Condiments      55277.56    14173.73
3   2013    Confections     36415.75    12138.58
4   2013    Dairy Products  30337.39    24400.00
5   2013    Seafood         53019.98    27905.25
6   2014    Beverages       81338.06    35400.00
7   2014    Condiments      55948.82    19981.72
8   2014    Confections     44478.36    24710.00
9   2014    Dairy Products  84412.36    32466.00
10  2014    Seafood         65544.19    14565.37
Ye



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