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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Mathematics Assessment IRT Parameters → IRT Parameters for Items in the Measurement and Geometry Subscale, Grade 12 Mathematics Combined National and State Assessment, By Item and Block: 2013
NAEP Technical DocumentationIRT parameters for items in the measurement and geometry subscale, grade 12 mathematics combined national and state assessment, by item and block: 2013
Block Item NAEP ID aj bj cj dj1 dj2 dj3  dj4 
† 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: In 2013 the measurement and geometry subscales were combined at grade 12. 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), 2013 Mathematics Assessment.
MA 1 M192801 0.81 -1.70 .19 † † † †
7 M178001 1.01 1.34 † -0.35 0.35 † †
8 M196601 0.84 -0.43 .16 † † † †
MB 1 M303801 0.65 -1.12 .19 † † † †
6 M305301 0.47 -1.79 .19 † † † †
10 M304201 0.96 1.01 .30 † † † †
13 M305101 1.37 0.88 .17 † † † †
MC 4 M197301 0.60 -0.08 .15 † † † †
5 M197302 0.76 -0.13 .10 † † † †
6 M197303 1.29 1.69 † † † † †
7 M197304 1.37 1.36 † † † † †
10 M1975CL 0.74 1.43 † 1.57 -0.96 -1.07 0.46
MD 1 M184201 1.19 0.73 † † † † †
7 M174901 1.80 1.40 .13 † † † †
11 M174801 1.43 2.51 † 0.25 -0.25 † †
13 M180101 2.40 1.87 .14 † † † †
ME 4 M194501 0.23 0.24 .19 † † † †
7 M185702 3.85 1.41 .10 † † † †
8 M185703 1.14 1.46 † 0.47 -1.34 0.19 0.68
11 M187701 0.68 0.74 † -0.54 0.54 † †
MF 6 M183401 1.23 1.88 † -0.58 0.58 † †
9 M175001 0.90 -0.12 .32 † † † †
10 M175002 0.83 1.74 † -0.46 2.06 1.07 -2.68
13 M182201 3.72 2.07 .20 † † † †
MG 2 M310601 0.44 0.71 .17 † † † †
5 M309101 1.49 -0.19 .15 † † † †
8 M304001 0.54 0.04 † -3.21 3.21 † †
11 M309901 1.16 1.52 .30 † † † †
MH 2 M193801 0.95 -0.67 .27 † † † †
4 M198601 2.09 1.26 .10 † † † †
6 M188201 0.85 1.56 † -0.88 0.88 -0.85 0.85
11 M1943CL 1.08 0.70 † 0.08 -0.08 † †
13 M189001 0.57 1.75 † 1.98 -1.98 † †
MI 1 M192701 0.86 0.50 .19 † † † †
5 M190501 1.01 0.91 .14 † † † †
8 M191901 0.89 1.14 † 0.06 -0.65 0.39 0.20
12 M198901 1.16 0.98 † 0.72 -0.72 † †
MJ 3 M178501 0.80 1.53 † -1.35 1.35 † †
6 M191701 0.74 0.49 † 0.29 -0.29 † †
12 M199401 1.01 0.52 .33 † † † †
13 M1897CL 0.39 2.17 † 0.13 -0.11 -0.25 0.23
MK 2 M199501 1.08 0.68 .28 † † † †
9 M199601 0.92 0.18 .22 † † † †
11 M183801 0.97 1.95 .16 † † † †
14 M176601 1.29 1.17 .18 † † † †
ML 3 M186001 0.92 0.21 † † † † †
8 M200001 0.49 -0.22 .22 † † † †
11 M194001 0.61 2.09 † -0.22 0.22 † †
13 M185001 2.40 1.43 .13 † † † †
MM 4 M305801 1.24 -0.10 .15 † † † †
7 M305501 1.12 -0.30 † † † † †
9 M306501 1.14 0.02 † † † † †
12 M305701 1.20 0.85 .20 † † † †
MN 1 M307801 0.56 -0.84 .20 † † † †
5 M308001 0.78 0.86 † † † † †
7 M308601 1.38 -0.16 .15 † † † †
9 M310301 1.05 0.27 .12 † † † †
13 M308901 2.47 1.35 .16 † † † †
Last updated 21 May 2017 (DC)
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