Table 2.
Estimated testlet effect variance by testing algorithm, testlet size, and true testlet effect variance.
| True Testlet Effect Variance | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 0.000 | 0.500 | 1.000 | 1.500 | ||||||
| Testing Algorithm | Testlet Size | M | SE | M | SE | M | SE | M | SE |
| MAT | 3 | 0.022 | 0.012 | 0.506 | 0.012 | 1.012 | 0.017 | 1.509 | 0.024 |
| 6 | 0.007 | 0.004 | 0.505 | 0.014 | 0.993 | 0.027 | 1.514 | 0.027 | |
| 9 | 0.010 | 0.005 | 0.510 | 0.006 | 1.015 | 0.033 | 1.553 | 0.045 | |
| RAN | 3 | 0.025 | 0.015 | 0.495 | 0.026 | 1.001 | 0.020 | 1.506 | 0.026 |
| 6 | 0.020 | 0.008 | 0.496 | 0.019 | 1.012 | 0.027 | 1.510 | 0.032 | |
| 9 | 0.019 | 0.012 | 0.511 | 0.018 | 1.062 | 0.043 | 1.603 | 0.049 | |
Testlet effect variances whose 95%-credibility interval does not cover the testlet effect variance used for data generation are written in bold face. MAT, multidimensional adaptive testing; RAN, random testlet selection.