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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → IRT Parameters for the Mathematics Assessments → IRT Parameters for Items in the Algebra Scale, Grade 12 Mathematics National Main Assessment, by Item and Block: 2009

NAEP Technical DocumentationIRT parameters for items in the algebra, grade 12 mathematics national main assessment, by item and block: 2009
Block1 Item NAEP ID aj bj cj dj1 dj2 dj3 dj4
1 Common blocks M13-M22 were previously named M3-M12 in 2005.
† 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), 2009 Mathematics Assessment.
M1 3 M183601 0.64 0.77 0.63 -0.63
5 M196501 0.66 0.42 0.28
9 M176401 1.05 1.79 0.20
11 M186101 2.22 0.77 0.23
13 M185801 1.94 1.69 0.11
M2 5 M184601 1.45 0.06 0.24
7 M190601 0.51 1.55 -3.28 3.28
9 M1809CL 0.46 1.64 0.16 2.11 0.11 -2.39
11 M181601 1.88 1.08 0.12
13 M179901 1.36 1.89 0.09
14 M197001 0.48 0.44 -2.28 2.28
M3 1 M197101 1.34 0.69 0.11
8 M193401 0.92 1.38 -0.09 0.09
11 M175101 0.50 3.73 0.16
12 M183301 1.35 1.66 0.18
14 M179201 1.68 1.75 0.40 -0.40
M4 6 M190401 1.01 -0.38 0.21
8 M197601 1.05 1.04 0.34 -0.34
10 M197701 1.92 1.26 0.23
14 M197901 1.32 0.04 0.09
M5 3 M177301 0.94 0.65 0.03 -0.03
9 M182601 1.23 0.54 0.19
13 M185201 0.76 -0.49
14 M198001 1.07 1.06 0.21
M6 3 M198201 2.23 -0.27 0.40
4 M198202 1.47 0.36 0.10
5 M198203 3.08 -0.07 0.36
7 M176701 0.75 1.50 0.11
14 M174701 1.38 1.30 0.17
M7 3 M189901 0.91 0.82 1.00 -1.00
6 M198401 0.96 0.20 0.24
8 M190101 0.69 -0.09 0.16
10 M195201 1.11 0.68 -0.27 0.27
M8 1 M187601 1.34 -0.29 0.13
7 M188401 2.06 1.19 0.14
9 M188001 0.72 0.16 -0.74 0.74
M9 2 M192901 1.07 -0.56 0.20
9 M192301 1.30 0.20 0.30
10 M198801 0.88 0.48 0.22
13 M185501 1.82 0.59 0.28
M10 7 M199101 2.97 1.16 0.15
8 M199201 0.59 1.19 -3.64 3.64
9 M190901 0.65 0.92 0.11
10 M199301 1.33 1.85 0.27
11 M190801 0.92 1.01 1.31 -1.31
M11 1 M184301 0.96 -1.21 0.21
4 M180701 1.43 0.12 0.16
10 M1765CL 0.55 0.83 0.67 -0.01 -0.37 -0.29
12 M189201 1.18 0.90 0.22
13 M183101 2.12 1.54
M12 2 M199801 0.95 0.96 0.17
6 M182101 1.02 1.75 0.32
7 M182102 1.57 1.65 0.09
10 M200101 0.92 0.35 0.15
12 M177901 1.25 1.77 0.37
M13 5 M055901 0.21 -3.76 0.20
12 M095201 1.62 1.09 0.17
15 M011831 1.69 1.48 0.20
16 M076601 0.91 0.76 -0.66 0.66
17 M095401 0.40 -0.16 -1.07 1.07
M14 10 M092701 0.93 -0.01 0.28
11 M053201 1.12 0.64 0.26
16 M019401 1.72 1.64 0.25
17 M019501 1.76 1.54 0.11
M15 13 M056101 1.06 0.54 0.23
18 M0717CL 2.21 1.67
19 M094701 0.40 0.59 1.59 -0.84 -0.27 -0.48
M16 8 M131501 1.73 1.44 0.04
11 M056301 1.14 -0.20 0.06
12 M128501 2.23 1.25 0.18
14 M130401 1.15 0.87 0.19
16 M071001 0.95 1.19 -0.16 0.16
M17 4 M130801 0.76 -0.48 0.08
7 M129501 0.84 0.50 0.14
11 M134901 0.81 0.04 0.13
13 M133301 0.77 0.25 0.09
14 M134701 2.28 1.28 0.18
15 M129601 1.02 0.46 0.19
18 M074101 0.52 0.68 -0.35 -0.13 0.48
M18 10 M052501 0.86 -0.02 0.30
17 M021601 2.22 2.13
18 M021602 1.60 1.76
M19 6 M0707CL 0.66 -0.52 0.83 -0.36 -0.47
14 M076401 1.43 1.18 0.30
16 M012031 0.96 0.67
17 M076501 0.83 1.59 0.16
19 M057101 2.34 1.87
M20 5 M021701 1.41 0.04
6 M021702 1.03 -0.38
7 M092101 1.07 0.43 0.24
8 M056401 1.03 0.33 0.31
9 M011431 1.25 0.18 0.19
10 M059401 1.62 0.87 0.22
13 M056201 1.01 0.46 0.25
14 M011531 1.74 0.91 0.08
15 M059301 1.30 0.71 0.16
18 M053401 0.23 0.94 2.27 -1.87 1.12 -1.51
M21 4 M127701 0.83 -0.80 0.18
8 M126101 0.68 0.29 0.27
11 M128701 1.46 1.12 0.22
13 M131201 1.07 1.34
15 M132301 1.89 0.87 0.09
17 M128901 1.15 1.85 0.25
M22 5 M127501 0.93 0.23 0.12
6 M133101 1.12 0.79 0.20
11 M127101 1.22 0.77 0.29
12 M133801 0.54 0.80 -1.15 1.15
14 M127001 1.22 0.88 0.14
17 M130101 2.77 1.21 0.16

Last updated 03 June 2016 (GF)