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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: 2005
Block-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 4 reading combined national and state main assessment: 2005
Statistic Type of school1 Block R3  Block R4  Block R5  Block R6  Block R7  Block R8  Block R9  Block R10  Block R11  Block R12 
Number of scaled items 9 10 11 9 10 10 10 10 10 10
Unweighted sample size Public 32,000 30,400 31,600 30,200 31,900 30,400 32,100 30,500 32,100 30,200
Nonpublic 1,200 1,200 1,200 1,300 1,300 1,300 1,300 1,200 1,200 1,200
Weighted average item score Public 0.52 0.70 0.46 0.62 0.43 0.54 0.78 0.61 0.75 0.61
Nonpublic 0.62 0.80 0.56 0.70 0.52 0.62 0.84 0.72 0.81 0.69
Weighted average polyserial Public 0.66 0.76 0.61 0.72 0.68 0.63 0.71 0.67 0.75 0.69
Nonpublic 0.64 0.79 0.63 0.69 0.67 0.62 0.66 0.65 0.73 0.69
Weighted alpha reliability Public 0.68 0.79 0.73 0.77 0.72 0.72 0.74 0.76 0.72 0.74
Nonpublic 0.64 0.74 0.73 0.70 0.72 0.68 0.65 0.69 0.60 0.71
Weighted proportion of students attempting last item2 Public 0.76 0.84 0.76 0.71 0.68 0.73 0.82 0.83 0.88 0.85
Nonpublic 0.86 0.94 0.86 0.80 0.77 0.84 0.91 0.92 0.93 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), 2005 Reading Assessment.

Last updated 23 March 2009 (GF)

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