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#' Collection of items fitting the Rasch model
#'
#' A data frame with administrative information per item with difficulty
#' estimates (`tau`) from the Rasch model. The item bank provides the basic
#' information to calculate D-scores. The items in the item bank
#' are a subset of all items as collected in [dscore::builtin_itemtable].
#'
#' The difficulty estimates were estimated by a Rasch model. The `key`
#' indicates the specific Rasch model used to estimate the difficulty.
#' Strictly speaking, one can only compare D-score calculated from the
#' same `key`.
#'
#' @docType data
#' @format A `data.frame` with variables:
#'
#' | Name | Label |
#' | -------------- | ---------------------------------------- |
#' | `key` | String indicating a specific Rasch model |
#' | `item` | Item name, gsed lexicon |
#' | `tau` | Difficulty estimate |
#' | `label` | Label (English) |
#' | `instrument` | Instrument code |
#' | `domain` | Domain code |
#' | `mode` | Administration mode |
#' | `number` | Item number |
#'
#' @note
#' Updates:
#'
#' - Dec 01, 2022 - Overwrite labels of gto by correct item order.
#' - Dec 05, 2022 - Adds key `gsed2212`, adding instruments `gl1` and `gs1`, and
#' defining correct order for `gto`
#' - Jan 05, 2023 - Adds instrument `gh1` to key `gsed2212`
#'
#' @examples
#' # count number of items per instrument in each key
#' table(builtin_itembank$instrument, builtin_itembank$key)
#' @seealso [dscore()], [get_tau()], [builtin_itemtable()]
"builtin_itembank"
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