builtin_itembank {dscore}

Collection of items fitting the Rasch model

Description

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 builtin_itemtable.

Usage

builtin_itembank

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

Details

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.

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

See Also

dscore(), get_tau(), builtin_itemtable()

Examples

# count number of items per instrument in each key
table(builtin_itembank$instrument, builtin_itembank$key)