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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → Item Response Theory Parameters → Reading Long-Term Trend Assessment Item Response Theory Parameters → IRT Parameters, by Block and Item, Age 9 Reading Long-Term Trend Assessment: 2004
NAEP Technical DocumentationIRT parameters, by block and item, age 9 reading long-term trend assessment: 2004
Block Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
R21 1 N021101 1.98 0.24 0.25 † † † †
2 N021102 1.58 -0.13 0.31 † † † †
3 N021201 1.64 0.09 0.33 † † † †
4 N021202 1.21 1.23 0.20 † † † †
5 N021203 0.53 0.93 † 2.14 0.25 -0.97 -1.42
6 N021301 1.78 0.41 0.23 † † † †
7 N021302 2.69 0.95 0.11 † † † †
8 N021303 2.03 1.00 0.25 † † † †
R22 1 N021401 0.76 0.28 0.38 † † † †
2 N021402 0.90 0.76 0.21 † † † †
3 N021403 1.76 1.40 0.22 † † † †
4 N021501 1.97 -0.02 0.24 † † † †
5 N021502 1.49 0.51 0.28 † † † †
6 N021503 1.42 -0.22 0.22 † † † †
7 N021601 1.39 -0.21 0.28 † † † †
8 N021602 0.90 0.23 0.28 † † † †
9 N021603 1.05 0.82 0.26 † † † †
10 N021701 1.30 -0.90 0.25 † † † †
R23 1 N021801 1.10 0.04 0.27 † † † †
2 N021802 1.50 1.39 0.38 † † † †
3 N021803 0.53 0.55 † 2.20 -2.00 -0.19 †
4 N021901 1.88 -0.42 0.32 † † † †
5 N022001 1.79 0.00 0.26 † † † †
6 N022002 1.22 -0.24 0.28 † † † †
7 N022003 1.44 0.34 0.38 † † † †
8 N022004 2.12 -0.09 0.28 † † † †
R24 1 N022101 1.42 -0.14 0.31 † † † †
2 N022102 2.66 1.06 0.16 † † † †
3 N022103 0.75 1.49 † 1.77 -0.15 -1.62 †
4 N022201 0.94 0.81 0.31 † † † †
5 N022202 1.42 -0.49 0.28 † † † †
6 N022203 1.55 0.14 0.24 † † † †
7 N022204 2.05 0.60 0.21 † † † †
8 N022205 2.22 0.60 0.23 † † † †
R25 1 N022301 2.36 0.30 0.25 † † † †
2 N022401 3.13 0.55 0.50 † † † †
3 N022402 2.22 0.61 0.21 † † † †
4 N022403 2.85 0.62 0.24 † † † †
5 N022404 4.16 0.71 0.17 † † † †
6 N022405 1.43 0.05 0.00 † † † †
7 N022501 0.83 -0.25 0.25 † † † †
8 N022601 0.71 -0.26 0.27 † † † †
R26 1 N022701 1.21 -0.39 0.33 † † † †
2 N022702 1.83 -0.04 0.19 † † † †
3 N022703 1.57 -0.58 0.34 † † † †
4 N022704 2.01 -0.21 0.19 † † † †
5 N022801 1.26 -1.63 0.29 † † † †
6 N022901 0.67 -1.67 0.21 † † † †
7 N023001 1.14 0.14 0.17 † † † †
8 N023002 1.38 0.69 0.25 † † † †
9 N023101 1.38 0.68 0.27 † † † †
10 N023102 1.64 0.63 0.23 † † † †
R27 1 N023201 1.93 -0.41 0.22 † † † †
2 N023202 1.33 0.22 0.31 † † † †
3 N023301 1.85 0.14 0.21 † † † †
4 N023401 0.90 -0.44 0.29 † † † †
5 N023402 2.56 0.47 0.33 † † † †
6 N023403 1.02 -0.16 0.25 † † † †
7 N023501 1.64 0.21 0.31 † † † †
8 N023502 1.17 0.09 0.22 † † † †
9 N023601 1.52 -0.10 0.32 † † † †
10 N023602 1.12 -0.57 0.22 † † † †
R28 1 N025901 1.01 -0.92 0.33 † † † †
2 N026001 1.83 -0.09 0.19 † † † †
3 N026002 1.49 -0.09 0.25 † † † †
4 N026003 1.93 -0.60 0.27 † † † †
5 N026101 1.46 0.69 0.20 † † † †
6 N026102 1.59 0.94 0.33 † † † †
7 N026201 1.50 -1.02 0.33 † † † †
8 N026301 1.45 -0.46 0.20 † † † †
9 N026302 1.15 -0.56 0.22 † † † †
R29 1 N026401 1.34 0.15 0.14 † † † †
2 N026402 1.23 0.37 0.22 † † † †
3 N026403 0.97 1.29 0.25 † † † †
4 N026404 1.55 0.24 0.23 † † † †
5 N026501 2.09 0.03 0.28 † † † †
6 N026502 0.90 -0.10 0.28 † † † †
7 N026503 1.28 0.02 0.26 † † † †
8 N026601 0.91 -1.93 0.25 † † † †
9 N026701 1.67 0.50 0.18 † † † †
10 N026801 1.87 0.87 0.27 † † † †
R30 1 N026901 1.53 0.45 0.28 † † † †
2 N026902 1.73 -0.67 0.26 † † † †
3 N027001 1.64 -0.38 0.19 † † † †
4 N027002 1.33 -0.14 0.22 † † † †
5 N027003 1.13 -0.66 0.24 † † † †
6 N027101 1.52 0.05 0.23 † † † †
7 N027102 1.09 0.18 0.31 † † † †
8 N027201 1.43 0.53 0.16 † † † †
9 N027202 1.66 -0.11 0.24 † † † †
10 N027203 2.17 0.38 0.20 † † † †
† 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 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), 2004 Reading Long-Term Trend Assessment.
Last updated 27 July 2009 (JL)

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