- Surveys & Programs
- Data & Tools
- Fast Facts
- News & Events
- Publications & Products
- About Us
Table of Contents | Search Technical Documentation | References
NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for Items in the Algebra Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2015
NAEP Technical DocumentationIRT Parameters for Items in the Algebra Subscale, Grade 4 Mathematics Combined National and State Assessment, by Item and Block: 2015
| Block | Item | NAEP ID | aj | bj | cj | dj1 | dj2 | dj3 | dj4 |
|---|---|---|---|---|---|---|---|---|---|
| M3 | 7 | M342501 | 0.82 | -0.48 | 0.15 | † | † | † | † |
| 10 | M344801 | 1.55 | -0.16 | 0.26 | † | † | † | † | |
| M4 | 2 | M146801 | 0.48 | -0.74 | † | † | † | † | † |
| M5 | 8 | M218901 | 0.63 | -2.34 | † | † | † | † | † |
| 12 | M219301 | 0.54 | 0.38 | 0.22 | † | † | † | † | |
| M6 | 7 | M342101 | 0.51 | 0.11 | † | -0.18 | 0.18 | † | † |
| 14 | M345201 | 1.56 | 1.01 | 0.16 | † | † | † | † | |
| M7 | 7 | M3468CL | 0.64 | -0.35 | † | 1.43 | -1.43 | † | † |
| 10 | M348501 | 0.83 | 0.05 | 0.15 | † | † | † | † | |
| 13 | M347501 | 1.16 | -0.22 | 0.18 | † | † | † | † | |
| M8 | 5 | M240601 | 0.57 | -1.65 | † | † | † | † | † |
| 13 | M2311CL | 0.79 | 0.42 | † | 0.09 | 0.43 | -0.52 | † | |
| M9 | 4 | M227601 | 0.67 | -0.97 | 0.08 | † | † | † | † |
| 12 | M226801 | 1.01 | 0.16 | † | † | † | † | † | |
| M10 | 1 | M219701 | 0.98 | -1.87 | 0.08 | † | † | † | † |
| 4 | M220001 | 0.46 | -1.82 | † | -1.81 | 1.81 | † | † | |
| M11 | 5 | M156601 | 0.70 | 0.19 | 0.09 | † | † | † | † |
| 9 | M156201 | 0.27 | 0.01 | 0.15 | † | † | † | † | |
| 16 | M1610CL | 0.20 | 1.09 | † | -0.95 | -1.84 | -0.68 | 3.47 | |
| M12 | 5 | M229201 | 0.86 | -0.70 | 0.12 | † | † | † | † |
| 8 | M228801 | 1.46 | 1.18 | 0.42 | † | † | † | † | |
| † Not applicable;
c parameters are not estimated for the two-parameter logistic model or generalized partial credit models, and
d parameters are not estimated for two-parameter or three-parameter logistic models. NOTE: For item j, aj represents the discriminatory power of the item, bj represents a location parameter related to item difficulty, cj represents the guessing parameter, and dji represents the category threshold parameter for category i. The c parameter value is assumed to be exactly zero and is not estimated for items scaled with the two-parameter logistic model. For item j, dji may not sum to zero because of rounding. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Mathematics Assessment. | |||||||||
Last updated 17 November 2021 (ML)
