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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 Algebra and Functions Scale, Grade 8 Mathematics Combined National and State Main Assessment, by Item and Block: 2007

NAEP Technical DocumentationIRT parameters for items in the algebra and functions scale, grade 8 mathematics combined national and state main assessment, by item and block: 2007
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
† Not applicable; c parameters are not estimated for 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 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), 2007 Mathematics Assessment.
M3 8 M150501 1.00 0.74 0.22 † † † †
9 M150601 1.09 1.84 0.09 † † † †
11 M150801 0.52 1.73 † -1.73 1.73 † †
14 M151101 1.31 0.53 0.04 † † † †
15 M151201 0.56 1.30 † † † † †
M4 5 M151701 1.24 0.18 0.21 † † † †
7 M151901 0.66 0.30 0.06 † † † †
9 M152101 0.60 0.71 0.14 † † † †
10 M152201 1.13 0.24 0.19 † † † †
13 M152501 1.75 1.21 0.12 † † † †
14 M152602 0.74 0.52 † 1.86 -2.75 0.89 †
M5 6 M019701 0.55 -2.27 † † † † †
11 M066501 0.48 -1.08 † -0.66 0.66 † †
M6 2 M140501 1.58 -0.15 0.21 † † † †
6 M140901 0.85 0.24 0.11 † † † †
12 M141501 1.14 0.28 0.26 † † † †
16 M141901 0.44 1.69 † 2.26 1.06 -0.89 -2.42
M7 1 M143601 0.99 -1.07 0.05 † † † †
9 M144401 0.76 0.24 0.08 † † † †
14 M144901 0.53 0.96 † 0.00 0.00 † †
15 M145001 1.65 0.29 0.19 † † † †
M8 10 M052501 1.08 0.71 0.20 † † † †
16 M067001 1.19 0.46 0.33 † † † †
17 M051701 1.10 -0.22 0.12 † † † †
M9 2 M0757CL 0.42 -1.28 † 2.44 -0.59 -1.85 †
4 M091701 1.14 -1.00 0.17 † † † †
10 M075301 1.11 -0.31 † 1.13 -1.13 † †
14 M013731 1.08 0.86 0.12 † † † †
M10 1 M142001 0.67 0.52 0.48 † † † †
7 M142601 1.14 -0.28 0.22 † † † †
8 M142701 1.14 0.19 0.08 † † † †
9 M142801 0.71 1.03 † † † † †
14 M143301 1.18 0.50 0.23 † † † †
M11 2 M105801 0.53 -1.28 0.12 † † † †
6 M106201 0.84 -0.41 0.30 † † † †
11 M106701 1.51 1.33 0.12 † † † †
15 M107101 0.56 0.62 0.14 † † † †
18 M107501 0.70 -1.13 † † † † †
M12 5 M153101 0.98 0.45 0.21 † † † †
7 M153301 1.65 1.24 0.13 † † † †
9 M153501 0.56 -0.75 0.14 † † † †
10 M153601 0.80 -0.88 † † † † †
12 M153801 1.80 1.04 0.13 † † † †
15 M154101 0.74 0.76 0.18 † † † †
17 M154301 1.90 1.29 0.16 † † † †
Last updated 08 January 2010 (JL)

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