NAEP Analysis and Scaling - Overall Descriptive Statistics for Items as Defined After Scaling, Grade 12 Writing National Main Assessment: 2002

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 12 Writing National Main Assessment: 2002

Overall descriptive statistics for items as defined after scaling, grade 12 writing national main assessment: 2002
Statistic	All items
Number of scaled items	20
Multiple choice	0
Dichotomously scored constructed response	0
Polytomously scored constructed response	20
Unweighted sample size	18,500
Weighted average item score	.57
Weighted average polyserial	.90
Weighted alpha reliability	†
† In NAEP writing assessments, each block contains only one item—a writing prompt to which students respond with a polytomously scored constructed response; therefore, the weighted alpha reliability estimate is not meaningful. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Writing Assessment.

Last updated 15 April 2008 (GF)

Printer-friendly Version

Would you like to help us improve our products and website by taking a short survey?

YES, I would like to take the survey

or

No Thanks

The survey consists of a few short questions and takes less than one minute to complete.

National Center for Education Statistics - http://nces.ed.gov
U.S. Department of Education

U.S. Department of Education
Institute of Education Sciences
National Center for Education Statistics