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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 12 Writing National Main Assessment: 2007
Overall descriptive statistics for items as defined after scaling, grade 12 writing national main assessment: 2007
Statistic Item type All items
† Not applicable.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Writing Assessment.
Number of ccaled items Total 20
Multiple choice 0
Dichotomously scored constructed response 0
Polytomously scored constructed response 20
Unweighted sample size 27,900
Weighted average item score 0.59
Weighted average polyserial 0.91
Weighted alpha reliability
Weighted proportion of students attempting last item

Last updated 07 June 2010 (JL)

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National Center for Education Statistics -
U.S. Department of Education