Skip to main content

Table of Contents  |  Search Technical Documentation  |  References

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 Bridge Study: 2004

NAEP Technical DocumentationIRT parameters, by block and item, age 9 reading long-term trend bridge study: 2004
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.
# Rounds to zero.
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.
H 2 N008601 1.54 -0.22 0.25
3 N008602 1.15 -0.05 0.24
4 N008603 1.09 -0.36 0.25
5 N008701 0.55 -3.15 0.26
6 N001521 1.90 -0.79 0.34
7 N001522 1.85 0.36 0.23
8 N001523 1.36 -0.40 0.30
9 N001524 1.89 0.40 0.24
10 N001527 1.11 1.96 0.00
J 1 N001601 0.63 0.26 0.22
2 N001602 1.24 0.48 0.27
3 N001603 0.75 1.10 0.30
4 N001604 1.10 0.92 0.25
5 N008801 1.14 -1.01 0.26
7 N001802 1.06 2.41 0.21
8 N008901 1.59 -0.27 0.21
9 N008902 1.02 -0.42 0.23
K 1 N002001 1.62 1.03 0.19
2 N002002 1.40 0.66 0.18
3 N002003 1.36 0.54 0.26
4 N009001 1.43 0.55 0.19
5 N009002 0.99 0.67 0.19
6 N009003 1.61 1.27 0.22
7 N009004 1.51 0.39 0.24
8 N009101 0.88 -0.74 0.26
9 N009201 1.20 -1.05 0.26
10 N002101 1.05 2.31 0.23
11 N002102 1.27 2.16 0.18
L 1 N002702 1.68 0.80 0.22
2 N009601 0.77 -1.32 0.20
3 N002401 1.35 0.79 0.16
4 N009401 1.30 -0.57 0.18
5 N002801 2.08 0.21 0.23
6 N002802 1.56 -0.04 0.23
7 N002804 0.69 1.46 0.00
M 1 N009701 0.95 0.18 0.25
2 N009702 1.92 0.14 0.28
3 N009703 1.39 0.69 0.25
4 N009704 1.08 0.75 0.19
5 N009705 1.83 0.13 0.25
6 N003001 0.89 2.15 0.20
7 N003002 0.56 0.74 0.25
9 N014001 1.05 0.03 0.27
10 N003101 1.06 0.27 0.27
11 N003102 1.87 0.86 0.19
12 N003104 1.00 2.45 0.00
N 1 N009801 1.01 -1.76 0.27
2 N009901 0.89 0.17 0.29
3 N014301 1.95 0.24 0.25
4 N014302 1.40 0.45 0.24
5 N014303 2.10 # 0.28
6 N010002 1.43 # 0.27
7 N010003 1.36 0.30 0.22
8 N010102 1.32 0.90 0.31
9 N010103 1.92 0.03 0.26
10 N003701 1.46 0.19 0.40
11 N003702 1.83 0.49 0.25
12 N003704 0.90 1.08 0.00
O 1 N003801 1.01 1.42 0.31
2 N003802 0.49 0.46 0.24
3 N003803 0.93 2.39 0.21
4 N010301 0.71 -1.15 0.25
5 N010201 0.92 -1.20 0.26
6 N004101 0.92 -0.22 0.30
7 N004201 1.13 1.03 0.22
8 N004202 0.79 1.70 0.33
9 N010401 0.56 -1.17 0.28
10 N010402 0.97 1.16 0.25
11 N010403 1.61 1.39 0.20
Q 1 N004701 1.85 0.40 0.20
2 N004702 0.73 -0.13 0.28
3 N004703 1.91 0.29 0.27
4 N004801 1.01 -0.49 0.31
5 N004901 1.31 1.15 0.21
6 N005101 0.74 -1.71 0.26
7 N010801 1.04 0.41 0.26
8 N010902 2.31 0.61 0.34
9 N010903 2.31 0.30 0.26
10 N010904 1.90 0.56 0.24
11 N014101 0.68 -0.05 0.23
R 1 N011001 1.29 0.25 0.28
2 N011002 1.83 0.55 0.25
3 N011003 1.97 -0.16 0.29
4 N011004 2.22 0.29 0.25
5 N011101 1.62 0.27 0.21
6 N011201 0.89 0.40 0.20
7 N011301 1.92 0.30 0.25
8 N011302 1.13 0.47 0.30
10 N011402 1.00 1.02 0.26
11 N011403 1.26 1.40 0.28
12 N011404 1.37 1.16 0.21
V 1 N013201 1.47 -0.02 0.19
2 N013301 1.10 -0.88 0.28
3 N013401 1.23 0.70 0.16
4 N013402 1.99 0.12 0.34
5 N013403 1.81 0.50 0.23
6 N014201 0.95 -0.41 0.19
7 N014501 0.69 -0.46 0.00
8 N014502 0.66 -0.67 0.00
9 N014503 1.04 -1.01 0.00
R21 1 N021101 1.93 0.46 0.29
2 N021102 1.37 0.15 0.25
3 N021201 1.48 0.17 0.28
4 N021202 1.27 1.49 0.20
5 N021203 0.44 1.54 2.58 0.47 -0.72 -2.32
6 N021301 2.10 0.64 0.27
7 N021302 2.74 1.12 0.13
8 N021303 2.56 1.14 0.24

Last updated 27 July 2009 (JL)

Printer-friendly Version