Skip Navigation

Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 8 Writing Combined National and State Main Assessment: 2007
Overall descriptive statistics for items as defined after scaling, grade 8 writing combined national and state 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 scaled Items Total 20
Multiple choice 0
Dichotomously scored constructed response 0
Polytomously scored constructed response 20
Unweighted sample size 139,900
Weighted average iem score 0.55
Weighted average polyserial 0.92
Weighted alpha reliability
Weighted proportion of students attempting last item

Last updated 23 June 2010 (GF)

Printer-friendly Version