R语言dplyr处理dataframe：使用mutate函数生成新的列、recode函数进行数据编码、rename函数重命名字段、arrange排序数据列、select筛选数据、filter过滤数据

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R语言使用dplyr包处理dataframe数据：使用mutate函数生成新的数据列、recode函数进行数据编码、rename函数重命名字段、arrange函数对数据列内容排序、select筛选数据列、filter函数过滤数据（Manipulating data with dplyr）

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