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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 Civics National Main Assessment: 2006
Overall descriptive statistics for item blocks as defined after scaling, grade 4 civics national main assessment: 2006
Statistic Item type Block C3 Block C4 Block C5 Block C6 Block C7 Block C8
Number of scaled items      Total 15 15 15 14 15 14
Multiple choice 11 11 12 10 11 11
Dichotomously scored constructed response 0 1 0 1 0 0
Polytomously scored constructed response 4 3 3 3 4 3
Unweighted sample size 2,300 2,400 2,300 2,300 2,300 2,300
Weighted average item score 0.52 0.47 0.49 0.57 0.53 0.53
Weighted average polyserial 0.52 0.53 0.55 0.53 0.56 0.49
Weighted alpha reliability 0.69 0.69 0.72 0.68 0.75 0.65
Weighted proportion of students attempting last item1 0.88 0.90 0.88 0.87 0.81 0.91
† Not applicable.
1  The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100).
NOTE: 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), 2006 Civics Assessment.

Last updated 23 June 2010 (GF)

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National Center for Education Statistics - http://nces.ed.gov
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