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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 Visual Arts National Main Assessment: 2008

Overall descriptive statistics for item blocks as defined after scaling, grade 8 arts (visual arts) assessment: 2008
Statistic Item type Block V3 Block V4 Block V5 Block V6
† 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), 2008 Arts (Visual Arts) Assessment.
Number of scaled items    Total 5 12 9 6
Multiple choice 1 4 3 2
Dichotomously scored constructed response 0 2 1 2
Polytomously scored constructed response 4 6 5 2
Unweighted sample size 1,900 2,100 1,900 1,900
Weighted average item score 0.44 0.46 0.45 0.45
Weighted average polyserial 0.64 0.53 0.58 0.60
Weighted alpha reliability 0.52 0.67 0.61 0.35
Weighted proportion of students attempting last item1 0.81 0.90 0.82 0.99

Last updated 28 September 2011 (JL)
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National Center for Education Statistics - http://nces.ed.gov
U.S. Department of Education