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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 4 Reading Combined National and State Main Assessment, by Public and Nonpublic School Sessions: 2007
Block-level descriptive statistics as defined after scaling, grade 4 reading combined national and state main assessment, by public and nonpublic school sessions: 2007
Statistic Type of school Block R3 Block R4 Block R5 Block R6 Block R7 Block R8 Block R9 Block R10 Block R11 Block R12
Number of scaled items 10 10 11 9 10 10 10 10 10 10
Unweighted sample size Public 36,700 36,500 36,100 36,400 36,400 36,600 36,900 36,500 36,400 36,500
Nonpublic 700 700 700 700 700 700 700 700 700 700
Weighted average item score Public 0.66 0.71 0.47 0.64 0.50 0.59 0.78 0.63 0.76 0.63
Nonpublic 0.71 0.81 0.54 0.70 0.57 0.67 0.83 0.72 0.82 0.71
Weighted average polyserial Public 0.68 0.77 0.60 0.71 0.62 0.70 0.71 0.66 0.76 0.69
Nonpublic 0.67 0.75 0.62 0.69 0.60 0.73 0.71 0.63 0.76 0.67
Weighted alpha reliability Public 0.74 0.79 0.72 0.76 0.70 0.76 0.74 0.75 0.71 0.74
Nonpublic 0.68 0.70 0.70 0.71 0.66 0.75 0.64 0.69 0.65 0.66
Weighted proportion of students attempting last item1 Public 0.86 0.83 0.76 0.71 0.80 0.79 0.82 0.81 0.89 0.85
Nonpublic 0.94 0.91 0.88 0.80 0.93 0.89 0.93 0.90 0.93 0.93
† Not applicable.
1 The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100).
NOTE: Nonpublic school samples include only Private and Catholic schools.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Reading Assessment.

Last updated 02 March 2010 (JL)

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