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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 12 Mathematics Combined National and State Main Assessment, by Public and Nonpublic School Sessions: 2009

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 12 mathematics combined national and state main assessment, by public and nonpublic school sessions: 2009
Statistic Type of School1 Block M1 Block M2 Block M3 Block M4 Block M5 Block M6 Block M7 Block M8 Block M9 Block M10 Block M11 Block M12 Block M13 Block M14 Block M15 Block M16 Block M17 Block M18 Block M19 Block M20 Block M21 Block M22
† 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: Common blocks M13-M22 were previously named M3-M12 in 2005.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2009 Mathematics Assessment.
Number of scaled items † 14 14 14 14 13 14 13 13 13 13 14 14 17 17 18 17 18 21 18 18 18 18
Unweighted sample size Public 6,100 6,100 6,200 6,200 6,100 6,100 6,200 6,100 6,100 6,200 6,200 6,100 1,900 1,900 1,900 1,800 2,000 1,900 1,900 2,000 1,900 1,900
Nonpublic 200 200 200 200 200 200 200 200 200 200 200 200 300 300 300 200 300 200 300 300 300 200
Weighted average item score Public 0.40 0.38 0.38 0.37 0.40 0.41 0.42 0.41 0.48 0.41 0.41 0.38 0.48 0.47 0.45 0.41 0.50 0.49 0.41 0.46 0.47 0.46
Nonpublic 0.47 0.46 0.45 0.45 0.48 0.47 0.50 0.48 0.56 0.45 0.48 0.43 0.56 0.57 0.50 0.49 0.53 0.53 0.47 0.51 0.50 0.49
Weighted average polyserial Public 0.61 0.62 0.63 0.66 0.66 0.64 0.71 0.71 0.67 0.67 0.65 0.63 0.62 0.61 0.59 0.65 0.62 0.63 0.68 0.64 0.61 0.59
Nonpublic 0.65 0.63 0.63 0.68 0.66 0.61 0.71 0.73 0.69 0.64 0.64 0.62 0.60 0.59 0.57 0.64 0.64 0.66 0.68 0.62 0.64 0.63
Weighted alpha reliability Public 0.72 0.73 0.70 0.77 0.77 0.73 0.79 0.81 0.78 0.76 0.74 0.71 0.80 0.77 0.77 0.79 0.81 0.79 0.83 0.79 0.79 0.78
Nonpublic 0.77 0.75 0.74 0.80 0.77 0.72 0.81 0.82 0.79 0.73 0.73 0.71 0.79 0.74 0.75 0.80 0.82 0.83 0.83 0.77 0.81 0.80
Weighted proportion of students attempting last item2 Public 0.82 0.88 0.67 0.92 0.97 0.94 0.85 0.84 0.95 0.94 0.96 0.98 0.88 0.93 0.89 0.91 0.88 0.68 0.71 0.91 0.98 0.95
Nonpublic 0.83 0.87 0.66 0.89 0.95 0.91 0.93 0.85 0.94 0.96 0.96 0.92 0.91 0.91 0.90 0.89 0.87 0.71 0.72 0.92 0.99 0.97
Last updated 05 January 2016 (GF)
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