NAEP Analysis and Scaling - Overall Descriptive Statistics for Items as Defined After Scaling, Grade 4 Writing Combined National and State Main Assessment: 2002

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 4 Writing Combined National and State Main Assessment: 2002

NAEP Technical DocumentationOverall descriptive statistics for items as defined after scaling, grade 4 writing combined national and state main assessment: 2002
Statistic	Item type	All items
Number of scaled items	Total	20
	Multiple choice	0
	Dichotomously scored constructed response	0
	Polytomously scored constructed response	20
Unweighted sample size	†	144,200
Weighted average item score	†	0.52
Weighted average polyserial	†	0.90
Weighted alpha reliability	†	—
† Not applicable. — 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 24 March 2009 (GF)