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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 Mathematics Combined National and State Main Assessment, by Public and Nonpublic School Sessions: 2007

Block-level descriptive statistics as defined after scaling, grade 8 mathematics combined national and state main assessment, by public and nonpublic school sessions: 2007
Statistic Type of school Block M3 Block M4 Block M5 Block M6 Block M7 Block M8 Block M9 Block M10 Block M11 Block M12
† 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 Mathematics Assessment.
Number of scaled items 15 14 18 16 16 18 18 16 19 17
Unweighted sample size Public 29,800 29,800 29,900 29,900 30,200 30,200 29,900 30,100 30,000 29,900
Nonpublic 600 600 600 600 600 700 600 600 600 600
Weighted average item score Public 0.45 0.43 0.60 0.50 0.50 0.53 0.47 0.51 0.54 0.48
Nonpublic 0.54 0.50 0.66 0.57 0.57 0.60 0.54 0.58 0.59 0.54
Weighted average polyserial Public 0.63 0.64 0.62 0.65 0.59 0.60 0.59 0.61 0.58 0.59
Nonpublic 0.62 0.65 0.63 0.60 0.51 0.61 0.59 0.61 0.56 0.59
Weighted alpha reliability Public 0.77 0.77 0.80 0.80 0.76 0.79 0.80 0.78 0.76 0.77
Nonpublic 0.77 0.78 0.80 0.75 0.67 0.79 0.78 0.76 0.73 0.76
Weighted proportion of students attempting last item1 Public 0.92 0.95 0.86 0.94 0.76 0.87 0.79 0.98 0.94 0.97
Nonpublic 0.93 0.95 0.93 0.96 0.80 0.91 0.83 0.99 0.97 0.98

Last updated 02 March 2010 (JL)

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