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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 Reading Combined National and State Main Assessment: 2002
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 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 Block R11 Block R132
Number of scaled items

10 9 11 12 13 10 9 12 12 13
Unweighted sample size Public 19,800 19,700 19,800 19,800 19,800 19,900 19,800 19,900 19,700 19,900
Nonpublic 1,000 900 1,000 1,000 900 1,000 1,000 1,000 1,000 1,000
Weighted average item score Public 0.42 0.56 0.69 0.57 0.70 0.54 0.61 0.61 0.69 0.65
Nonpublic 0.51 0.62 0.79 0.67 0.79 0.63 0.69 0.70 0.77 0.72
Weighted average polyserial Public 0.69 0.61 0.74 0.62 0.72 0.61 0.67 0.60 0.71 0.60
Nonpublic 0.65 0.56 0.76 0.57 0.70 0.57 0.64 0.56 0.68 0.55
Weighted alpha reliability Public 0.77 0.67 0.79 0.71 0.79 0.70 0.68 0.73 0.80 0.72
Nonpublic 0.72 0.59 0.74 0.58 0.69 0.58 0.59 0.66 0.72 0.60
Weighted proportion of students attempting last item3 Public 0.79 0.83 0.94 0.86 0.83 0.84 0.95 0.75 0.83 0.93
Nonpublic 0.86 0.88 0.97 0.93 0.90 0.89 0.97 0.78 0.88 0.97
† Not applicable.
1 Nonpublic-school sample includes only Catholic and private schools.
2 A 50-minute block.
3 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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