NAEP tdw - Overall Descriptive Statistics for Items as Defined After Scaling, Grade 8 Meaning Vocabulary Combined National and State Assessment, by Block: 2013

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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 8 Meaning Vocabulary Combined National and State Assessment, by Block: 2013

NAEP Technical DocumentationOverall block-level descriptive statistics for items as defined after scaling, grade 8 meaning vocabulary combined national and state assessment, by block: 2013
Statistic	Block R14	Block R15	Block R16	Block R17	Block R18	Block R19	Embedded items
† Not applicable. ¹¹ The unweighted sample associated with the embedded items is the average unweighted sample across all embedded meaning vocabulary items. ²²The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item/100). NOTE: The meaning vocabulary assessment includes multiple-choice items only. The embedded items column contains information about only those meaning vocabulary items embedded within the 25-minute reading comprehension blocks.. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Reading Assessment.
Number of scaled items	6	5	5	5	6	5	24
Unweighted sample size¹	4,500	5,400	5,400	4,400	3,700	3,800	24,500
Weighted average item score	.55	.59	.91	.79	.75	.76	.77
Weighted average polyserial	.68	.73	1.22	.91	.82	.85	.66
Weighted alpha reliability	.47	.46	.72	.58	.58	.49	†
Weighted proportion of students attempting last item²	1.00	.99	1.00	1.00	.99	1.00	†

Last updated 21 May 2017 (DC)

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