NAEP Analysis and Scaling - Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 Reading Vocabulary Combined National and State Assessments, by Public and Nonpublic School Sessions: 2011

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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 Reading Vocabulary Combined National and State Assessments, by Public and Nonpublic School Sessions: 2011

NAEP Technical DocumentationBlock-level descriptive statistics for public- and nonpublic-school sessions as defined after scaling, grade 8 reading vocabulary combined national and state assessments, by public and nonpublic school sessions: 2011
Statistic	Type of school¹	Block R14	Block R15	Block R16	Block R17	Block R18	Block R19	Embedded blocks
† Not applicable. ¹ Nonpublic school sample includes only private and Catholic schools. NOTE: The "embedded blocks" column contains information about all the reading vocabulary items embedded within the 25-minute reading comprehension blocks. The unweighted sample associated with the embedded items is the average unweighted sample across all embedded reading vocabulary items. The "weighted average item score" of polytomous items are standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. The "weighted proportion of students attempting last item" is equal to 1- (percent not responding to last item /100). 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), 2011 Reading Vocabulary Assessment.
Number of scaled items	†	6	5	5	5	6	5	†
Unweighted sample size	Public	3,700	4,600	4,700	3,700	3,700	3,700	23,300
Unweighted sample size	Nonpublic	200	300	200	200	200	200	1,200
Weighted average item score	Public	.51	.56	.90	.80	.71	.75	.74
Weighted average item score	Nonpublic	.65	.72	.99	.89	.78	.85	.82
Weighted average polyserial	Public	.68	.74	1.21	.92	.76	.85	.64
Weighted average polyserial	Nonpublic	.71	.74	1.79	1.00	.89	.95	.59
Weighted alpha reliability	Public	.48	.48	.76	.58	.51	.52	†
Weighted alpha reliability	Nonpublic	.51	.38	.45	.44	.52	.49	†
Weighted proportion of students attempting last item	Public	1.00	.99	1.00	1.00	1.00	1.00	†
Weighted proportion of students attempting last item	Nonpublic	1.00	1.00	1.00	1.00	1.00	1.00	†

Last updated 03 June 2016 (GF)

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