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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 Reading Combined National and State Assessment, by Block and Item Type: 2015

NAEP Technical DocumentationOverall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 Reading Combined National and State Assessment, by Block and Item Type: 2015

Overall descriptive statistics for item blocks as defined after scaling, grade 4 reading combined national and state assessment, by block and item type: 2015
Statistic	Item type	Block R1	Block R2	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10
Number of scaled items	Total	11	8	10	10	10	10	10	10	9	8
	Multiple choice	8	5	7	7	6	7	7	6	6	6
	Dichotomously scored constructed-response	1	1	0	0	1	0	0	0	1	1
	Polytomously scored constructed-response	2	2	3	3	3	3	3	4	2	1
Unweighted sample size	†	27,700	27,700	27,600	27,800	27,800	27,700	27,700	27,700	27,800	27,600
Weighted average item score¹	†	.68	.64	.59	.58	.51	.52	.58	.51	.59	.57
Weighted average polyserial	†	.66	.69	.74	.70	.67	.66	.63	.69	.70	.65
Weighted alpha reliability	†	.75	.68	.79	.76	.75	.74	.72	.77	.73	.59
Weighted proportion of students attempting last item²	†	.86	.81	.82	.85	.83	.79	.78	.79	.86	.90
† Not applicable. ¹ The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items. ² The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). NOTE: 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), 2015 Reading Assessment.

Last updated 09 November 2021 (ML)

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