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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 12 Reading National Main Assessment: 2002
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 12 reading national 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 R12  Block R132
Number of scaled items

10 9 8 12 11 8 9 12 10 16 7
Unweighted sample size Public 1,400 1,400 1,400 1,400 1,400 1,400 1,400 1,400 1,400 1,400 1,400
Nonpublic 900 800 800 800 800 800 800 800 900 800 800
Weighted average item score Public 0.54 0.51 0.45 0.67 0.51 0.55 0.74 0.70 0.55 0.61 0.37
Nonpublic 0.64 0.60 0.54 0.72 0.60 0.61 0.82 0.79 0.65 0.71 0.45
Weighted average polyserial Public 0.71 0.69 0.64 0.70 0.62 0.65 0.76 0.66 0.69 0.61 0.68
Nonpublic 0.68 0.64 0.64 0.71 0.58 0.59 0.76 0.62 0.69 0.60 0.62
Weighted alpha reliability Public 0.79 0.70 0.69 0.70 0.64 0.72 0.71 0.74 0.76 0.79 0.68
Nonpublic 0.74 0.62 0.68 0.63 0.50 0.65 0.58 0.62 0.75 0.74 0.57
Weighted proportion of students attempting last item3 Public 0.85 0.73 0.81 0.92 0.83 0.88 0.95 0.85 0.86 0.97 0.94
Nonpublic 0.87 0.72 0.86 0.96 0.85 0.92 0.98 0.86 0.92 0.98 0.99
† 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 06 February 2009 (GF)

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