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R语言dplyr包group_by函数和summarise_at函数计算dataframe计算不同分组的计数个数和均值（Summarise Data by Categorical Variable）
2022-06-24 19:43:00 【statistics.insight】
R语言dplyr包group_by函数和summarise_at函数计算dataframe计算不同分组的计数个数和均值（Summarise Data by Categorical Variable）
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