A key contains the item difficulty estimates from a given Rasch model.
The difficulty estimates (tau) are used to calculate D-scores.
D-scores can only be compared when calculated with the same key.
builtin_keysbuiltin_keys is a data.frame with variables:
| Name | Label |
key | String. Name of the key indicating the Rasch model |
base_population | String. Name of the base population for the key |
n_items | Number of items in the key |
n_instruments | Number of instruments in the key |
intercept | Intercept to convert logit into D-score |
slope | Slope to convert logit into D-score |
from | Starting value of the quadrature points |
to | Stopping value of the quadrature points |
by | Increment of the quadrature points |
retired | Has the key been retired? |
20240609 SvB: Added builtin_keys table by
data-raw\data\R\save_builtin_keys.R