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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 4 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 4 U.S. history national main assessment (accommodations not permitted [R2]): 2001
Statistic Type of school1 Block H3 Block H4 Block H5 Block H6 Block H7 Block H8
Number of scaled items 14 16 15 15 16 17
Unweighted sample size Public 2,000 2,000 2,000 2,000 2,000 2,000
Nonpublic 400 400 400 300 300 300
Weighted average item score Public 0.42 0.45 0.47 0.47 0.43 0.42
Nonpublic 0.49 0.53 0.57 0.52 0.50 0.48
Weighted average polyserial Public 0.49 0.53 0.53 0.51 0.47 0.49
Nonpublic 0.46 0.50 0.52 0.48 0.44 0.51
Weighted alpha reliability Public 0.65 0.73 0.74 0.73 0.69 0.69
Nonpublic 0.56 0.67 0.70 0.64 0.59 0.68
Weighted proportion of students attempting last item2 Public 0.83 0.82 0.90 0.75 0.67 0.82
Nonpublic 0.91 0.89 0.96 0.86 0.77 0.90
† Not applicable.
1 Nonpublic-school sample includes only Catholic and private schools.
2 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100).
NOTE: Item statistics in this table are described on the page Blocks of Items.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment.

Last updated 11 July 2008 (DB)

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