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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Block-level Descriptive Statistics for Items as Defined After Scaling, Grade 12 Mathematics Combined National and State Assessment, by Block: 2013
NAEP Technical DocumentationOverall block-level descriptive statistics for items as defined after scaling, grade 12 mathematics combined national and state assessment, by block: 2013
StatisticItem typeBlock M1Block M2Block M3Block M4Block M5Block M6Block M7Block M8Block M9Block M10Block M11Block M12Block M13Block M14
† Not applicable.
1 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item /100).
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. 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), 2013 Mathematics Assessment.
Number of scaled itemsTotal1414141413141313131314141413
Multiple choice910989101081089101010
Dichotomously scored constructed response10211111103221
Polytomously scored constructed response44353324252222
Unweighted sample size†6,6006,5006,5006,5006,5006,5006,7007,0006,7007,0006,6006,5006,5006,700
Weighted average item score†.41.45.39.37.42.42.53.40.47.40.42.39.45.40
Weighted average polyserial†.60.61.63.66.66.64.61.72.68.67.63.61.63.65
Weighted alpha reliability†.70.76.70.77.77.74.73.81.79.76.73.69.75.74
Weighted proportion of students attempting last item1 †.85.95.72.90.96.94.98.87.95.94.96.96.98.91
Last updated 21 May 2017 (DC)
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