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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Reading Long-Term Trend Assessments → IRT Parameters for Single Overall Scale, Age 9 Reading Long-Term Trend Assessment, by Item and Block: 2012
NAEP Technical DocumentationIRT parameters for single overall scale, age 9 reading long-term trend assessment, by item and block: 2012
Block Item NAEP ID aj bj cj dj1 dj2 dj3 
† 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), 2012 Reading Long-Term Trend Assessment.
RA 1 N021101 1.69 0.05 0.25 † † †
2 N021102 1.55 -0.28 0.35 † † †
3 N021201 1.83 -0.04 0.31 † † †
4 N021202 0.97 1.26 0.16 † † †
5 N021203 0.49 1.54 † 0.99 -0.16 -0.83
6 N021301 1.25 0.16 0.24 † † †
7 N021302 1.96 0.93 0.09 † † †
8 N021303 1.53 1.07 0.20 † † †
RB 1 N021401 0.53 -0.16 0.31 † † †
2 N021402 0.75 0.49 0.19 † † †
3 N021403 1.36 1.27 0.20 † † †
4 N021501 1.59 -0.14 0.23 † † †
5 N021502 1.09 0.27 0.25 † † †
6 N021503 1.22 -0.45 0.24 † † †
7 N021601 1.62 -0.21 0.30 † † †
8 N021602 0.98 0.48 0.39 † † †
9 N021603 0.91 0.78 0.20 † † †
10 N021701 1.35 -0.95 0.26 † † †
RC 1 N021801 1.19 -0.08 0.34 † † †
2 N021802 1.29 1.33 0.41 † † †
RC 3 N021803Y 0.43 0.65 † 2.56 -2.52 -0.03
RC 3 N021803Z 0.51 0.14 † 1.88 -1.88 †
RC 4 N021901 1.70 -0.60 0.31 † † †
5 N022001 1.47 -0.14 0.24 † † †
6 N022002 1.34 -0.47 0.23 † † †
7 N022003 1.18 0.00 0.35 † † †
8 N022004 2.14 -0.28 0.24 † † †
RD 1 N022101 1.80 -0.26 0.32 † † †
2 N022102 1.95 1.00 0.18 † † †
3 N022103 0.64 1.47 † 2.29 -0.14 -2.15
4 N022201 1.32 0.97 0.39 † † †
5 N022202 1.55 -0.59 0.27 † † †
6 N022203 1.39 -0.04 0.22 † † †
7 N022204 1.92 0.61 0.23 † † †
8 N022205 1.76 0.45 0.18 † † †
RE 1 N022401 4.05 0.52 0.45 † † †
2 N022402 2.51 0.59 0.22 † † †
3 N022403 3.19 0.69 0.24 † † †
4 N022404 5.03 0.75 0.16 † † †
5 N022405 1.35 -0.07 0.00 † † †
6 N022501 0.94 -0.25 0.36 † † †
7 N022601 0.72 -0.69 0.31 † † †
RF 1 N022701 1.09 -0.55 0.36 † † †
2 N022702 1.43 -0.30 0.24 † † †
3 N022703 1.24 -0.98 0.37 † † †
4 N022704 1.84 -0.42 0.22 † † †
5 N022801 1.16 -2.05 0.25 † † †
6 N022901 0.63 -1.81 0.22 † † †
7 N023001 1.04 0.03 0.19 † † †
8 N023002 1.35 0.60 0.28 † † †
9 N023101 1.43 0.63 0.28 † † †
10 N023102 1.14 0.50 0.25 † † †
RG 1 N023301 1.28 0.03 0.23 † † †
2 N023401 0.73 -0.91 0.29 † † †
3 N023402 1.70 0.22 0.31 † † †
4 N023403 0.87 -0.56 0.25 † † †
5 N023501 1.84 0.13 0.38 † † †
6 N023502 1.23 -0.04 0.27 † † †
7 N023601 1.51 -0.26 0.39 † † †
8 N023602 0.90 -1.18 0.19 † † †
RH 1 N025901 0.98 -1.26 0.28 † † †
2 N026001 2.13 -0.05 0.26 † † †
3 N026002 1.28 -0.25 0.25 † † †
4 N026003 1.63 -0.85 0.19 † † †
5 N026101 1.21 0.61 0.13 † † †
6 N026102 1.56 1.01 0.30 † † †
7 N026201 1.15 -1.37 0.33 † † †
8 N026301 1.73 -0.44 0.23 † † †
9 N026302 0.91 -0.95 0.21 † † †
RH 1 N033801 0.62 -1.50 0.26 † † †
2 N033803 0.81 -1.74 0.28 † † †
3 N033901 0.93 -0.05 0.25 † † †
4 N033902 1.46 -0.11 0.25 † † †
5 N033903 1.89 0.11 0.15 † † †
6 N030001 1.55 0.17 0.18 † † †
7 N030002 1.61 -0.16 0.22 † † †
8 N034101 1.77 -0.49 0.29 † † †
9 N034102 1.91 -0.53 0.31 † † †
RI 1 N028601 1.39 -1.07 0.30 † † †
2 N028602 1.47 -0.82 0.27 † † †
3 N028701 1.74 -0.25 0.37 † † †
4 N028702 1.42 -0.27 0.23 † † †
5 N028703 1.04 -0.19 0.27 † † †
6 N028704 1.67 -0.80 0.26 † † †
7 N028801 1.21 0.19 0.20 † † †
8 N028802 0.85 0.42 0.25 † † †
9 N028901 1.06 0.29 0.29 † † †
10 N028902 1.35 1.14 0.22 † † †
RJ 1 N026901 1.29 0.28 0.26 † † †
2 N026902 1.54 -0.82 0.28 † † †
3 N027001 1.33 -0.67 0.20 † † †
4 N027002 1.11 -0.33 0.22 † † †
5 N027003 0.99 -1.03 0.16 † † †
6 N027101 1.54 0.05 0.25 † † †
7 N027102 1.06 -0.06 0.30 † † †
8 N027201 1.42 0.45 0.16 † † †
9 N027202 1.63 -0.23 0.27 † † †
10 N027203 2.18 0.42 0.24 † † †
Last updated 01 July 2014 (GF)
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