Description Usage Arguments Author(s)
Compute summary statistics according to a factor (data.frame input)
| 1 2 3 4 5 6 |   summarize.data.frame.by(df, by, funs = c(mean, sd,
  quantile, n, na), ..., useNA = c("no", "ifany",
  "always"), addmargins = FALSE, revert = FALSE, test =
  FALSE, test.summarize = test.summarize.auto, show.test =
  display.test, plim = 4, show.method = TRUE, label =
  FALSE)
 | 
| df | data.frame | 
| by | data.frame | 
| funs | fuctions | 
| ... | passed to funs | 
| useNA | useNA | 
| addmargins | addmargins | 
| revert | whether to regroup factors or numeric variables when crossing factor with numeric variables | 
David Hajage
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