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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Score ScalesNAEP Assessment IRT ParametersArts Assessment IRT ParametersIRT Parameters, Grade 8 Arts Assessment, by Item and Block: 2008

NAEP Technical DocumentationIRT parameters, grade 8 arts assessment, by item and block: 2008
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
† Not applicable; c parameters are not estimated for generalized partial credit models.
# Rounds to zero.
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 is the category threshold parameter for category i. The c parameter value is exactly zero 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), 2008 Arts Assessment.
V3 2 VC00002 0.48 -0.14 † 0.53 -0.53 † †
3 VC00003 1.08 1.71 0.30 † † † †
4 VCCL004 0.38 -0.04 † 1.05 0.15 0.37 -1.57
5 VC00005 0.49 0.34 † 3.39 -1.03 -2.37 †
7 VC00007 0.43 0.56 † 1.37 -0.93 -0.44 †
V4 1 VD00001 0.45 -0.96 # † † † †
2 VD00002 0.49 0.39 0.28 † † † †
4 VD00004 0.42 3.38 0.25 † † † †
5 VD000A5 0.67 0.23 † 1.07 -1.07 † †
5 VD000B5 0.80 -0.03 † 0.57 -0.57 † †
6 VD000A6 0.61 0.85 † 0.25 -0.25 † †
6 VD000B6 0.71 0.04 # † † † †
7 VD00007 0.53 0.34 † 1.56 -1.56 † †
8 VD00008 0.44 1.69 † 3.31 -3.31 † †
9 VD00009 0.30 -0.87 † 3.45 -0.94 -2.52 †
10 VD00010 0.67 1.67 0.17 † † † †
11 VD00011 0.69 0.75 0.25 † † † †
V5 1 VE00001 0.30 -1.07 # † † † †
2 VE00002 0.52 1.06 † 2.52 -0.87 -1.64 †
3 VE00303 0.67 1.02 † 1.26 -1.26 † †
4 VE00004 0.36 0.52 † 1.86 -1.86 † †
5 VE00005 0.66 1.35 0.20 † † † †
6 VE00006 0.82 0.82 0.24 † † † †
7 VE00007 1.09 1.03 0.18 † † † †
8 VE00008 0.73 0.51 † 0.32 -0.32 † †
10 VE00010 0.43 -1.64 † 1.27 -1.27 † †
V6 1 VF00001 0.42 0.36 # † † † †
2 VF00002 0.33 0.00 0.24 † † † †
3 VF00003 0.50 0.40 0.24 † † † †
4 VF00004 0.42 -0.44 † 1.30 -1.30 † †
6 VF000A6 0.25 2.33 † -0.75 0.75 † †
7 VF000A7 0.39 1.69 # † † † †
Last updated 24 October 2011 (JL)
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