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dplyr summarise: Equivalent of “.drop=FALSE” to ke

来，给爷笑一个·2019-01-03 04:47·3 回答·问答

Unique rows, considering two columns, in R, withou

查无此人·2019-01-02 21:19·4 回答·问答

Fastest way to add rows for missing values in a da

流年柔荑漫光年·2019-01-01 16:08· 评论·文章

Fastest way to add rows for missing values in a da

素衣白纱·2019-01-01 16:04·4 回答·问答

Why does summarize or mutate not work with group_b

若你有天会懂·2018-12-31 23:06· 评论·文章

Why does summarize or mutate not work with group_b

谁念西风独自凉·2018-12-31 22:44·2 回答·问答

How to create a lag variable within each group?

看风景的人·2018-12-31 15:55· 评论·文章

How to create a lag variable within each group?

浮光初槿花落·2018-12-31 15:53·5 回答·问答

How to select the rows with maximum values in each

流年柔荑漫光年·2018-12-31 14:54· 评论·文章

How to select the rows with maximum values in each

初与友歌·2018-12-31 14:50·4 回答·问答

Convert data from long format to wide format with

牵手、夕阳·2018-12-31 07:34·4 回答·问答

Faster ways to calculate frequencies and cast from

听够珍惜·2018-12-31 01:41·3 回答·问答

Reshape three column data frame to matrix (“long”

宁负流年不负卿·2018-12-31 01:31·4 回答·问答

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