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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 Combined National and State Main Assessment: 2002
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 4 reading combined national and state main assessment: 2002
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 10 9 12
Unweighted sample size Public 33,100 33,400 32,800 33,200 32,900 33,100 33,000 33,200
Nonpublic 1,400 1,400 1,400 1,400 1,400 1,400 1,400 1,400
Weighted average item score Public 0.53 0.64 0.47 0.59 0.44 0.55 0.60 0.66
Nonpublic 0.62 0.72 0.55 0.68 0.54 0.63 0.66 0.73
Weighted average polyserial Public 0.66 0.68 0.62 0.71 0.69 0.64 0.64 0.65
Nonpublic 0.62 0.67 0.62 0.71 0.64 0.62 0.62 0.62
Weighted alpha reliability Public 0.70 0.80 0.74 0.78 0.75 0.74 0.73 0.77
Nonpublic 0.63 0.73 0.73 0.75 0.70 0.70 0.66 0.69
Weighted proportion of students attempting last item2 Public 0.72 0.65 0.75 0.67 0.65 0.68 0.68 0.82
Nonpublic 0.85 0.79 0.87 0.80 0.75 0.79 0.79 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), 2002 Reading Assessment.

Last updated 16 February 2009 (GF)

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