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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 Reading National Main Assessment (Accommodations Not Permitted [R2]): 2000
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 4 reading national main assessment (accommodations not permitted [R2]): 2000
Statistic Type of school1 Block R3 Block R4 Block R5 Block R6 Block R7 Block R8 Block R9 Block R10
Number of scaled items 9 12 11 9 10 9 9 12
Unweighted sample size Public 1,500 1,500 1,400 1,500 1,500 1,500 1,500 1,500
Nonpublic 500 500 500 500 500 500 500 500
Weighted average item score Public 0.48 0.62 0.44 0.60 0.42 0.52 0.60 0.65
Nonpublic 0.58 0.71 0.53 0.70 0.52 0.59 0.66 0.70
Weighted alpha reliability Public 0.71 0.81 0.74 0.79 0.72 0.73 0.77 0.77
Nonpublic 0.60 0.68 0.74 0.73 0.72 0.64 0.70 0.73
Weighted average polyserial Public 0.65 0.69 0.63 0.73 0.68 0.65 0.64 0.65
Nonpublic 0.61 0.62 0.63 0.71 0.68 0.58 0.60 0.67
Weighted proportion of students attempting last item2 Public 0.75 0.66 0.75 0.70 0.64 0.73 0.71 0.85
Nonpublic 0.85 0.78 0.86 0.78 0.75 0.84 0.83 0.91
† 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), 2000 Reading Assessment.

Last updated 11 July 2008 (DB)

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