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.
builtin_itembankA 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 |
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.
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
# count number of items per instrument in each key
table(builtin_itembank$instrument, builtin_itembank$key)
#>
#> 293_0 dutch gcdg gsed1912 gsed2212 gsed2406
#> aqi 0 0 29 17 17 17
#> bar 0 0 15 13 13 13
#> by1 0 0 85 76 76 76
#> by2 0 0 16 16 16 16
#> by3 0 0 105 67 67 67
#> cro 0 0 0 62 64 64
#> ddi 0 76 65 64 64 64
#> den 0 0 67 50 50 50
#> dmc 0 0 0 43 43 43
#> ecd 0 0 0 0 18 18
#> gh1 0 0 0 0 55 55
#> gl1 0 0 0 0 155 155
#> gpa 138 0 0 0 138 138
#> gri 0 0 104 93 93 93
#> gs1 0 0 0 0 139 139
#> gsd 0 0 0 0 7 7
#> gto 155 0 0 0 155 155
#> iyo 0 0 0 55 57 57
#> kdi 0 0 0 48 48 48
#> mac 0 0 3 3 3 3
#> mds 0 0 0 1 1 1
#> mdt 0 0 0 126 126 126
#> mul 0 0 0 138 0 0
#> peg 0 0 1 1 1 1
#> sbi 0 0 6 5 5 5
#> sgr 0 0 19 19 19 19
#> tep 0 0 33 31 31 31
#> vin 0 0 17 17 17 17