| tapplydf | R Documentation | 
a friendly version of tapply for dataframes
tapplydf(data, select = names(data), myfactor, ..., na.rm = c(TRUE,
  FALSE, NULL)[1])
| data | dataframe | 
| select | character, column names to calc | 
| myfactor | a colname as factor | 
| ... | function to apply to data | 
| na.rm | logical | 
a dataframe
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