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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 Assessment, by Public and Nonpublic School Sessions: 2013
NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 12 mathematics combined national and state assessment, by public and nonpublic school sessions: 2013
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
1 Nonpublic school sample includes only private schools, including Catholic schools.
2 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item /100).
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Mathematics Assessment.
Number of scaled items † 14 14 14 14 13 14 13 13 13 13 14 14 14 13
Unweighted sample size Public 6,400 6,300 6,200 6,300 6,300 6,300 6,500 6,800 6,500 6,800 6,400 6,300 6,300 6,500
Nonpublic 200 200 200 200 200 200 200 200 200 200 200 200 200 200
Weighted average item score Public .41 .45 .38 .37 .41 .42 .52 .39 .46 .40 .42 .39 .45 .39
Nonpublic .45 .50 .42 .43 .50 .48 .60 .47 .57 .43 .49 .44 .52 .42
Weighted average polyserial Public .60 .61 .63 .66 .66 .64 .61 .72 .67 .67 .63 .61 .63 .64
Nonpublic .58 .61 .59 .64 .62 .61 .62 .75 .70 .67 .59 .60 .61 .66
Weighted alpha reliability Public .70 .76 .70 .77 .77 .74 .73 .80 .78 .76 .73 .68 .75 .74
Nonpublic .68 .75 .68 .76 .73 .70 .73 .83 .79 .76 .68 .69 .72 .76
Weighted proportion of students attempting last item2  Public .85 .95 .71 .90 .96 .94 .98 .86 .95 .94 .96 .96 .98 .91
Nonpublic .82 .97 .79 .90 .97 .96 1.00 .93 .96 .94 .97 .98 .99 .90
Last updated 21 May 2017 (DC)
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