Sample interview questions: Can you discuss your experience with item analysis and test equating methods?
Sample answer:
Item analysis and test equating methods are fundamental aspects of psychometrics that I have extensive experience with. In my role as a Psychometrician, I have worked on numerous projects involving the development and analysis of psychological tests. These experiences have provided me with a deep understanding of the intricacies and importance of item analysis and test equating methods.
Item analysis is a statistical technique used to evaluate the quality of individual test items. It helps to determine the difficulty level, discriminatory power, and reliability of each item. Through item analysis, we can assess the extent to which an item effectively measures the construct of interest. This involves examining item difficulty, which refers to the proportion of examinees who answer an item correctly. Additionally, item discrimination is analyzed, which measures the extent to which an item differentiates between high and low performers. By conducting item analysis, we can identify problematic items that may need revision or removal from the test, ensuring the overall quality of the assessment.
Test equating, on the other hand, is a process used to ensure the comparability of scores across different test forms or administrations. It is particularly relevant when dealing with assessments that have multiple forms or when comparing scores over time. Test equating allows us to establish a common scale that enables meaningful comparisons between different test versions. This is crucial to ensure fairness and equity in assessment, as it enables accurate comparisons of individual test-takers’ performances, regardless of which version of the test they took.
There are various methods for conducting item analysis and test equating, and as a Psychometric… Read full answer