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

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

NAEP Technical DocumentationOverall block-level descriptive statistics for items as defined after scaling, grade 8 mathematics combined national and state assessment, by block: 2013
Statistic	Item type	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12
† Not applicable. ¹ The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item /100). ² Blocks M4, M5, M9, M10, M11, and M12 have larger sample sizes due to their pairing with integrated pilot blocks. Sample sizes across administered blocks varied due to the integrated pilot design, as well as the increased use of some blocks for various accommodations. NOTE: 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. 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), 2013 Mathematics Assessment.
Number of scaled items	Total	15	14	15	16	16	15	15	15	17	15
	Multiple choice	11	11	11	13	11	12	12	11	12	11
	Dichotomously scored constructed response	2	0	1	1	1	0	1	0	0	3
	Polytomously scored constructed response	2	3	3	2	4	3	2	4	5	1
Unweighted sample size ²	†	31,500	32,800	32,700	31,600	35,300	32,800	36,800	32,900	32,800	32,800
Weighted average item score	†	.49	.46	.47	.53	.47	.55	.59	.56	.47	.56
Weighted average polyserial	†	.63	.65	.54	.64	.59	.69	.69	.62	.58	.62
Weighted alpha reliability	†	.77	.79	.72	.80	.74	.83	.82	.77	.78	.74
Weighted proportion of students attempting last item¹	†	.91	.94	.81	.91	.95	.97	.95	.88	.86	.82

Last updated 21 May 2017 (DC)

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