DIFFICULTY_PARAMETER_B1

Business Definition

IRT difficulty parameter (b1) representing the ability level at which an examinee has a 50% probability of answering correctly. Lower values indicate easier items, higher values indicate harder items. This parameter is central to CAT algorithms and item selection logic. Null for items without IRT calibration.

Data Type

FLOAT

Nullable

Yes

Last Updated

2026-01-13T04:05:42 by LEARNOSITY_ITEMS_DIM_ANALYSIS