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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 12 Geography National Assessment, by Public and Nonpublic School Sessions: 2010
NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 12 geography national assessment, by public and nonpublic school sessions: 2010
Statistic Type of school1 Block G3 Block G4 Block G5 Block G6 Block G7 Block G8 Block G9
† Not applicable.
1 Nonpublic school sample includes only private and Catholic schools.
NOTE: The "weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. The "weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). 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), 2010 Geography Assessment.
Number of scaled items † 16 17 17 16 16 16 21
Unweighted sample size Public 2,200 2,200 2,200 2,200 2,200 2,200 2,200
Nonpublic 290 280 290 290 300 300 290
Weighted average item score Public .54 .50 .45 .56 .47 .36 .50
Nonpublic .59 .58 .52 .62 .52 .44 .52
Weighted average polyserial Public .57 .52 .53 .54 .55 .56 .58
Nonpublic .58 .51 .51 .52 .55 .57 .55
Weighted alpha reliability Public .72 .73 .74 .74 .73 .71 .79
Nonpublic .71 .71 .70 .70 .71 .71 .77
Weighted proportion of students attempting last item  Public .95 .89 .93 .95 .65 .75 1.00
Nonpublic .93 .91 .94 .95 .65 .81 .99
Last updated 05 January 2016 (GF)
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