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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 8 U.S. History National Main Assessment (Accommodations Permitted [R3]): 2001
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 U.S. history national main assessment (accommodations permitted [R3]): 2001
Statistic Type of school1 Block H3  Block H4  Block H5  Block H6  Block H7  Block H8  Block H9  Block H10  Block H11 
Number of scaled items 17 16 17 17 16 17 16 16 13
Unweighted sample size Public 2,000 2,000 2,000 2,000 2,000 2,000 2,000 2,000 2,000
Nonpublic 300 300 300 300 300 300 300 300 300
Weighted average item score Public 0.56 0.44 0.42 0.45 0.65 0.63 0.42 0.38 0.45
Nonpublic 0.67 0.54 0.51 0.58 0.74 0.69 0.49 0.45 0.57
Weighted average polyserial Public 0.60 0.55 0.58 0.52 0.57 0.61 0.53 0.51 0.62
Nonpublic 0.53 0.55 0.57 0.51 0.57 0.64 0.50 0.54 0.56
Weighted alpha reliability Public 0.76 0.76 0.76 0.72 0.75 0.77 0.68 0.63 0.76
Nonpublic 0.65 0.75 0.77 0.68 0.67 0.78 0.66 0.67 0.64
Weighted proportion of students attempting last item2 Public 0.97 0.97 0.90 0.97 0.93 0.98 0.98 0.89 1.00
Nonpublic 0.98 0.97 0.93 0.99 0.99 0.99 0.99 0.92 1.00
† 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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