関連ワード:  r split dataframe by column value    r split dataframe by column value dplyr    r divide dataframe by column value    r separate dataframe by column value    r split data frame based on column value    split dataframe into multiple dataframes by column value r    split dataframe into multiple data frames r by column value    split dataframe by column value    split dataframe based on column value  
結果 : r split dataframe by column value