id_across_datasets: ID across datasets
In kim: Behavioral Scientists' Analysis Toolkit

Description Usage Arguments Value Examples

Create an ID column in each of the data sets. The ID values will span across the data sets.

id_across_datasets(
  dt_list = NULL,
  id_col_name = "id",
  id_col_position = "first",
  silent = FALSE
)

`dt_list`	a list of data.table objects
`id_col_name`	name of the column that will contain ID values
`id_col_position`	position of the newly created ID column. If `id_col_position = "first"`, the new ID column will be placed as the first column in respective data sets. If `id_col_position = "last"`, the new ID column will be placed as the last column in respective data sets.
`silent`	If `silent = TRUE`, a summary of starting and ending ID values in each data set will not be printed. If `silent = FALSE`, a summary of starting and ending ID values in each data set will be printed. (default = FALSE)

the output will be a list of data.table objects.

# running the examples below requires importing the data.table package.
prep(data.table)
id_across_datasets(
dt_list = list(setDT(copy(mtcars)), setDT(copy(iris))))
id_across_datasets(
dt_list = list(setDT(copy(mtcars)), setDT(copy(iris)), setDT(copy(women))),
id_col_name = "newly_created_id_col",
id_col_position = "last")