PhillRob
/ stratifiedDT.R
Last active
August 29, 2015 14:27
— forked from mrdwab/stratifiedDT.R
Attempt to rewrite stratified for `data.table`. The `data.frame` version can be found at https://gist.github.com/mrdwab/6424112
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| stratifiedDT <- function(indt, group, size, select = NULL, | |
| replace = FALSE, keep.rownames = FALSE, | |
| bothSets = FALSE) { | |
| require(data.table) | |
| if (is.numeric(group)) group <- names(indt)[group] | |
| if (!is.data.table(indt)) indt <- as.data.table( | |
| indt, keep.rownames = keep.rownames) | |
| if (is.null(select)) { | |
| indt <- indt | |
| } else { |