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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 Data Analysis, Statistics, and Probability Subscale, Grade 12 Mathematics Combined National and State Assessment, By Item and Block: 2013
NAEP Technical DocumentationIRT parameters for items in the data analysis, statistics, and probability 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: 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 2 M188701 0.94 -0.22 .25 † † † †
4 M182401 2.41 1.26 .18 † † † †
12 M1867CL 0.35 -0.41 † -0.12 1.40 -0.74 -0.55
14 M175901 0.74 3.25 † 0.81 -0.81 † †
MB 2 M305601 0.92 -0.31 .22 † † † †
4 M306701 0.44 0.67 † 0.14 -0.14 † †
8 M304901 1.02 0.03 .18 † † † †
12 M301701 1.12 1.04 .14 † † † †
MC 3 M197201 0.55 -0.45 .18 † † † †
13 M195401 0.13 -0.07 .21 † † † †
MD 2 M1842CL 0.80 -1.39 † 1.16 -1.16 † †
3 M1843CL 0.84 1.32 † 0.09 -0.09 † †
4 M184207 0.64 1.69 † -0.43 0.43 † †
9 M179101 0.75 0.11 .18 † † † †
ME 1 M183001 1.09 -0.55 .23 † † † †
5 M183201 0.99 0.62 .20 † † † †
10 M188101 1.15 0.12 .26 † † † †
MF 2 M198101 1.01 0.13 .18 † † † †
8 M175601 0.57 -0.36 † -1.15 1.15 † †
11 M177201 1.04 0.24 .20 † † † †
12 M177202 0.93 1.13 † † † † †
MG 1 M309201 1.40 -0.33 .22 † † † †
6 M307901 0.71 -0.76 .19 † † † †
10 M308201 1.25 1.12 .14 † † † †
13 M310001 0.52 0.19 † 0.48 -0.56 0.08 †
MH 5 M189301 1.61 0.25 .29 † † † †
8 M189501 0.61 0.76 .20 † † † †
10 M187101 1.31 0.44 .26 † † † †
12 M178601 1.33 0.27 .09 † † † †
MI 3 M198701 0.75 0.19 † † † † †
4 M177601 0.50 1.13 .18 † † † †
7 M181901 1.10 0.30 .17 † † † †
11 M193601 1.44 -0.42 .10 † † † †
MJ 2 M189601 0.99 -0.13 .22 † † † †
4 M194201 0.77 -0.24 .16 † † † †
5 M178401 1.14 -0.14 .13 † † † †
MK 5 M181201 0.67 -0.73 † † † † †
6 M181202 1.21 0.70 † 1.68 -1.68 † †
7 M181203 0.49 3.35 † † † † †
ML 4 M175301 0.85 -0.13 .16 † † † †
5 M199901 0.90 0.40 .21 † † † †
MM 3 M302701 0.40 0.22 † -6.32 6.32 † †
5 M304101 0.91 -0.19 .20 † † † †
11 M304701 0.87 1.58 .16 † † † †
MN 6 M310201 1.21 1.60 .04 † † † †
8 M310501 0.58 0.59 † -4.04 4.04 † †
11 M310901 0.80 2.08 .23 † † † †
12 M3111CL 0.84 1.92 † 0.39 1.24 -3.10 1.46
Last updated 21 May 2017 (DC)
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