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HomeTDWNAEP Analysis and ScalingEstimation of NAEP Score ScalesItem Response Theory ParametersMathematics Long-Term Trend Assessment Item Response Theory ParametersIRT Parameters, by Block and Item, Age 9 Mathematics Long-Term Trend Bridge Study: 2004

NAEP Technical DocumentationIRT parameters, by block and item, age 9 mathematics long-term trend bridge study: 2004
Block Item NAEP ID aj bj cj
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. The c parameter value is exactly zero for items scaled with the two-parameter logistic model.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004 Mathematics Long-Term Trend Assessment.
M1 1 N270901 0.71 -2.81 0.00
2 N277401 0.95 -1.73 0.19
3 N267601 1.39 -0.55 0.25
4 N276801 0.64 -3.55 0.00
5 N276802 0.56 -2.44 0.00
6 N276803 0.63 -0.09 0.00
7 N250701 0.68 -1.37 0.13
8 N250702 1.17 0.50 0.13
9 N250703 1.04 -0.46 0.13
10 N262201 0.76 -0.57 0.37
11 N257201 0.91 -0.78 0.24
12 N276101 1.03 -1.00 0.00
13 N286101 0.96 -0.96 0.00
14 N270001 0.62 -0.62 0.00
15 N272102 0.99 -0.48 0.20
16 N284001 0.80 -0.97 0.00
17 N284002 0.81 1.48 0.00
18 N267602 1.12 -0.10 0.15
19 N262501 0.53 -0.12 0.34
21 N265401 0.43 3.97 0.31
22 N266101 1.08 1.58 0.30
23 N269101 0.81 1.05 0.28
24 N268201 1.53 0.58 0.24
25 N252101 0.80 1.08 0.24
M2 1 N272301 0.88 -2.22 0.23
2 N276601 1.13 -0.82 0.30
3 N257801 0.66 -1.45 0.18
4 N263401 0.88 -1.37 0.32
5 N263402 0.79 -0.86 0.29
6 N273501 0.83 -0.99 0.37
7 N275401 1.08 -1.02 0.00
8 N277501 0.82 -0.71 0.00
9 N277601 0.83 -0.97 0.00
10 N277602 0.80 -0.02 0.00
11 N277603 0.80 -0.19 0.00
12 N261401 0.50 -0.66 0.20
13 N250601 0.95 -2.41 0.22
14 N250602 0.49 -2.34 0.16
15 N250603 0.86 -0.27 0.14
16 N251401 0.81 -0.73 0.17
17 N250901 0.48 -1.80 0.17
18 N250902 0.96 0.40 0.12
19 N250903 1.00 -0.26 0.09
20 N250301 1.56 0.76 0.35
21 N276001 0.92 -0.96 0.00
22 N276002 1.01 0.88 0.00
23 N286102 0.99 -0.09 0.00
24 N271101 0.79 -0.34 0.00
25 N252001 1.42 1.26 0.24
26 N269001 0.95 1.93 0.08
M21 1 N291601 0.93 -0.43 0.13
2 N291701 0.76 -0.94 0.23
3 N291801 1.25 2.32 0.14
4 N291901 0.56 1.73 0.23
5 N292001 0.63 -0.62 0.10
6 N292101 1.00 -0.78 0.00
7 N292201 0.85 1.17 0.17
8 N292301 0.86 0.45 0.33
9 N292401 0.49 -0.39 0.00
10 N292501 1.59 1.13 0.46
11 N292601 1.41 0.13 0.15
12 N292701 1.06 -0.86 0.24
13 N292801 0.79 -1.26 0.27
14 N292901 1.32 -0.71 0.13
15 N293001 0.85 -0.31 0.00
16 N293101 1.21 -1.70 0.18
17 N293201 1.21 0.91 0.19
18 N293301 0.93 -0.83 0.00
19 N293401 1.18 -0.88 0.22
20 N293501 0.72 -0.71 0.00
21 N293601 1.19 1.06 0.18
22 N293701 1.59 0.25 0.11
23 N293801 1.17 0.63 0.21
M22 1 N293901 1.18 -0.88 0.16
2 N294001 0.92 -1.88 0.16
3 N294101 0.80 -1.81 0.23
4 N294201 0.80 -2.39 0.00
5 N294301 0.93 -0.83 0.00
6 N294401 0.91 -0.46 0.20
7 N294501 0.86 -0.47 0.14
8 N294601 1.06 0.11 0.17
9 N294701 0.53 -1.70 0.16
10 N294801 1.66 2.03 0.16
11 N294901 0.82 0.34 0.18
12 N295001 0.59 -1.66 0.18
13 N295101 1.03 -0.28 0.17
14 N295201 1.11 -0.24 0.17
15 N295301 1.04 -0.89 0.00
16 N295401 1.08 -0.26 0.00
17 N295501 1.18 0.41 0.17
18 N295601 0.83 -1.08 0.19
19 N295701 1.09 0.89 0.00
20 N295801 1.10 0.47 0.24
21 N295901 1.25 1.49 0.09
22 N296001 1.19 0.44 0.28
23 N296101 1.09 0.95 0.24
Last updated 15 September 2009 (GF)

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