Sample interview questions: Can you explain the process of item selection and test assembly for cognitive assessments using computerized adaptive testing (CAT)?
Sample answer:
Item Selection Process
- Item Bank Development: A comprehensive database of cognitive assessment items with calibrated difficulty levels and psychometric properties is established.
- Item Calibration: Items are administered to a representative sample to determine their difficulty and discrimination parameters using item response theory (IRT) models.
- Item Selection Algorithm: A mathematical algorithm selects items based on their calibrated difficulty level, discrimination, and information function.
- Adaptive Targeting: The algorithm adjusts the difficulty of subsequent items based on the individual’s performance, converging towards the respondent’s estimated ability level.
Test Assembly Process
- CAT Platform: A computerized platform manages test administration, item selection, and scoring.
- Test Length and Time Limits: The number of items and test duration are predetermined based on psychometric considerations and practical constraints. Read full answer