Skip to main content
Skip Navigation
IES    
NCES
National Center for
Education Statistics
Menu
Contact
Tools
ED.gov
Newsflash
Search IES

Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → Science Assessment IRT Parameters → IRT Parameters for the Earth Science Scale, by Block and Item, Grade 4 Science National Main Assessment (Accommodations Permitted [R3]): 2000
NAEP Technical DocumentationIRT parameters for the earth science scale, by block and item, grade 4 science national main assessment (accommodations permitted [R3]): 2000
Block Item NAEP ID aj bj cj dj1 dj2 dj3
S7 1 K031401 0.25 3.90 0.00 3.20 0.23 -3.43
2 K031402 0.72 1.06 0.00 † † †
3 K031403 0.69 -0.45 0.00 0.62 -0.62 †
4 K031404 1.02 -0.36 0.00 † † †
5 K031405 1.19 1.96 0.18 † † †
6 K031406 0.82 0.59 0.46 † † †
7 K031407 0.41 -1.09 0.00 † † †
8 K031408 0.66 0.01 0.00 0.62 -0.62 †
9 K031409 0.89 0.12 0.00 † † †
10 K031410 0.38 0.76 0.00 0.73 -0.73 †
S10 2 K031801 0.83 0.81 0.20 † † †
3 K031901 0.53 -0.15 0.00 0.61 -0.61 †
6 K032201 1.01 0.36 0.14 † † †
7 K032301 1.05 1.51 0.18 † † †
8 K032401 1.13 1.16 0.16 † † †
S11 2 K099501 0.30 2.02 0.00 1.77 -1.77 †
4 K090001 1.77 1.52 0.18 † † †
6 K099301 0.70 -0.59 0.21 † † †
9 K098701 1.29 0.47 0.18 † † †
13 K099801 0.50 -0.38 0.23 † † †
14 K099901 0.46 2.20 0.21 † † †
S12 1 K033601 0.54 -1.92 0.26 † † †
2 K033701 0.55 -0.99 0.20 † † †
3 K033801 1.02 -0.13 0.23 † † †
9 K034401 0.45 0.20 0.00 0.60 -0.60 †
10 K034501 0.66 1.00 0.00 1.83 -1.40 -0.43
11 K034502 0.42 1.57 0.00 -0.88 0.88 †
6 K2341CL 0.42 0.46 0.00 -0.37 1.15 -0.79
S13 7 K035001 0.64 -0.60 0.26 † † †
8 K035101 0.66 1.16 0.18 † † †
9 K034102 0.70 -1.53 0.19 † † †
10 K035201 0.87 0.97 0.00 † † †
11 K035301 0.66 0.71 0.00 2.37 -0.78 -1.59
S14 7 K036001 0.57 2.57 0.25 † † †
8 K036101 0.72 1.31 0.00 1.14 -1.14 †
S15 5 K037401 0.82 2.59 0.00 -0.06 0.06 †
7 K037601 0.66 1.80 0.00 0.57 -0.57 †
S20 2 K094201 0.28 -1.34 0.24 † † †
3 K099401 0.37 -0.22 0.23 † † †
8 K094701 0.67 1.19 0.22 † † †
12 K099601 0.48 0.76 0.00 0.81 -0.81 †
13 K094301 0.51 1.83 0.20 † † †
S21 2 K039601 0.80 -0.99 0.17 † † †
4 K039801 0.48 -1.33 0.00 1.25 -1.25 †
10 K040401 0.43 1.89 0.00 -2.46 2.43 0.03
11 K040501 0.75 0.70 0.00 † † †
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling.
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 or the generalized partial credit model.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2000 Science Assessment.
Last updated 15 July 2008 (KL)

Printer-friendly Version


IES    
NCES
National Center for
Education Statistics
Explore the Institute of Education Sciences