karagawa
karagawa
/ stratified.R
Created
August 9, 2016 17:12
— forked from mrdwab/stratified.R
Stratified random sampling from a `data.frame` in R
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| stratified <- function(df, group, size, select = NULL, | |
| replace = FALSE, bothSets = FALSE) { | |
| if (is.null(select)) { | |
| df <- df | |
| } else { | |
| if (is.null(names(select))) stop("'select' must be a named list") | |
| if (!all(names(select) %in% names(df))) | |
| stop("Please verify your 'select' argument") | |
| temp <- sapply(names(select), | |
| function(x) df[[x]] %in% select[[x]]) |
karagawa
/ stratifiedDT.R
Created
August 9, 2016 17:18
— 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
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| stratifiedDT <- function(indt, group, size, select = NULL, | |
| replace = FALSE, keep.rownames = FALSE, | |
| bothSets = FALSE) { | |
| 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 { | |
| if (is.null(names(select))) stop("'select' must be a named list") |