NAEP tdw - Block-Level Descriptive Statistics as Defined After Scaling, Grade 4 Mathematics Combined National and State Assessment, by Public and Nonpublic School Sessions: 2013

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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 4 Combined Mathematics National and State Assessment, by Public and Nonpublic School Sessions: 2013

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 4 mathematics combined national and state assessment, by public and nonpublic school sessions: 2013
Statistic	Type of school¹	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12
† Not applicable. ¹ Nonpublic school sample includes only private schools, including Catholic schools. ² The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item/100). ³ Blocks M4, M5, M8, M9, M10, and M11 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: 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	†	15	15	15	15	15	15	15	15	16	13
Unweighted sample size³	Public	33,600	35,100	35,300	34,000	35,900	37,600	35,200	35,700	35,400	34,000
Unweighted sample size³	Nonpublic	600	600	600	600	600	600	600	500	600	600
Weighted average item score	Public	.52	.52	.63	.58	.51	.61	.56	.57	.56	.61
Weighted average item score	Nonpublic	.56	.57	.64	.60	.53	.64	.58	.57	.59	.62
Weighted average polyserial	Public	.63	.60	.63	.61	.60	.63	.62	.59	.55	.64
Weighted average polyserial	Nonpublic	.61	.58	.65	.62	.59	.60	.62	.56	.51	.66
Weighted alpha reliability	Public	.77	.74	.78	.76	.77	.76	.76	.71	.71	.75
Weighted alpha reliability	Nonpublic	.75	.72	.78	.75	.75	.73	.74	.67	.65	.75
Weighted proportion of students attempting last item²	Public	.95	.90	.90	.94	.89	.88	.93	.97	.93	.97
Weighted proportion of students attempting last item²	Nonpublic	.98	.94	.95	.97	.95	.95	.98	.97	.97	.99

Last updated 21 May 2017 (DC)

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