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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 Geometry Subscale, Grade 4 Mathematics Combined National and State Assessment, By Item and Block: 2013
NAEP Technical DocumentationIRT parameters for items in the geometry subscale, grade 4 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.
MC 2 M145301 1.03 -1.29 .22 † † † †
4 M145501 0.77 1.27 .26 † † † †
5 M145601 0.46 -1.64 .22 † † † †
MD 1 M146701 0.82 -1.24 .25 † † † †
3 M146901 0.41 0.09 † -0.66 0.66 † †
4 M147001 0.48 0.23 † 0.01 -0.01 † †
ME 11 M219201 0.77 -1.36 .17 † † † †
15 M219601 0.30 -1.11 .22 † † † †
MF 2 M135701 0.56 -3.24 .19 † † † †
MG 6 M158601 0.82 -0.02 .18 † † † †
10 M156801 0.45 0.23 .09 † † † †
MH 7 M230901 0.71 -0.23 .30 † † † †
11 M241001 0.71 0.50 .12 † † † †
MI 3 M224301 0.32 -2.41 † -2.03 2.03 † †
13 M338701 0.76 1.24 .16 † † † †
MJ 2 M219801 0.74 -1.37 .21 † † † †
5 M220101 0.97 0.24 .15 † † † †
MK 4 M156101 0.47 0.71 † -0.07 0.07 † †
13 M157501 0.66 -0.43 † 0.74 -0.74 † †
ML 3 M227201 0.41 -0.15 † -0.92 0.92 † †
6 M227701 0.96 -0.23 .10 † † † †
12 M339401 0.62 0.37 † 0.24 -0.24 † †
Last updated 21 May 2017 (DC)
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