An IERI – International Educational Research Institute Journal
Table 1. Summary of changes of item parameters
P+ | P+ | b | b | a | a | |
|---|---|---|---|---|---|---|
2015 | 2018 | 2015 | 2018 | 2015 | 2018 | |
Response-level filtering | 39 items changed (38 increased; 1 decreased) | 51 items changed (50 increased; 1 decreased) | 8 items changed (2 increased; 6 decreased) | 16 items changed (1 increased; 15 decreased) | 11 items changed (5 increased; 6 decreased) | 18 items changed (14 decreased; 4 increased) |
Examinee-level filtering | 45 items changed (43 increased; 2 decreased) | 51 items changed (49 increased; 2 decreased) | 36 items changed (36 decreased) | 48 items changed (48 decreased) | 39 items changed (8 increased; 31 decreased) | 44 items changed (7 increased; 37 decreased) |