R language dplyr package summary_ The at function calculates the count number, mean and median of multiple data columns (specified by vectors) in the dataframe data, and specifies na RM parameter, spe

R Language dplyr package summarise_at Function calculation dataframe Multiple data columns in the data （ Specify by vector ） Number of counts 、 Mean and median 、 Specify... Inside each function na.rm Parameters 、 adopt list Specify function list

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