The Effect of Ratio of Items Indicating Differential Item Functioning on Computer Adaptive and Multi-Stage Tests

Recently, adaptive test approaches have become a viable alternative to traditional fixed-item tests. The main advantage of tests is that they reach desired measurement precision with fewer items. However, items mean each item has more significant effect on ability estimation and therefore those are open consequential results from any flaw in an item. So, indicating differential functioning (DIF) may play important role examinees' scores. This study, therefore, aimed investigate the DIF performance computer multi-stage For this purpose, different designs were tested under lengths ratios using Monte Carlo simulation. As result, it was seen (CAT) had best over all conditions. When (MST) panel compared, found 1-3-3 design higher most conditions; however, findings not enough say performed better than 1-2-4 design. Furthermore, CAT be least affected by increase ratio MST increment especially 10-item length test.