Table 6 Parameter estimates for the EM-CBM probes and CBM-R passages
From: A comparison of two estimation algorithms for Samejima’s continuous IRT model
| EstCRM package | EM2 program | |||||
|---|---|---|---|---|---|---|
| a | b | α | a | b | α | |
| NI | 1.265 (.145) | 1.126 (.073) | .888 (.059) | 1.383 (.079) | 1.159 (.044) | 0.847 (.031) |
| QD | 1.261 (.162) | .707 (.046) | .870 (.061) | 1.385 (.096) | 0.726 (.031) | 0.821 (.036) |
| QA | 0.932 (.079) | 1.789 (.139) | .504 (.042) | 0.966 (.051) | 1.867 (.210) | 0.465 (.021) |
| P1 | 2.112 (.125) | 1.669 (.042) | 1.734 (.050) | 2.490 (.106) | 1.913 (.041) | 1.454 (.029) |
| P2 | 1.357 (.051) | 1.773 (.038) | 1.994 (.047) | 1.856 (.060) | 1.969 (.036) | 1.678 (.028) |
| P3 | 4.822 (.772) | 1.673 (.034) | 1.965 (.047) | 5.142 (.645) | 1.944 (.034) | 1.628 (.026) |