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

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 4 reading combined national and state assessment, by public and nonpublic school sessions: 2013
Statistic	Type of school¹	Block R1	Block R2	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10
† Not applicable. ¹ Nonpublic school sample includes only private schools, including Catholic schools. ²The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item/100). NOTE: Blocks R1, R2, R4, R6, R7, and R9 have larger sample sizes due to their pairing with integrated pilot 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	†	11	8	11	10	10	10	10	10	9	8
Unweighted sample size	Public	35,000	35,000	32,500	35,000	32,700	34,200	35,100	32,600	34,200	32,600
Unweighted sample size	Nonpublic	600	600	500	600	600	600	600	600	600	600
Weighted average item score	Public	.67	.64	.63	.57	.49	.51	.57	.51	.59	.56
Weighted average item score	Nonpublic	.76	.70	.70	.64	.55	.57	.65	.57	.68	.63
Weighted average polyserial	Public	.66	.68	.63	.69	.63	.66	.63	.63	.69	.64
Weighted average polyserial	Nonpublic	.66	.66	.58	.65	.63	.67	.64	.61	.69	.63
Weighted alpha reliability	Public	.75	.68	.72	.75	.71	.74	.71	.70	.73	.59
Weighted alpha reliability	Nonpublic	.66	.61	.58	.67	.70	.74	.66	.65	.69	.54
Weighted proportion of students attempting last item²	Public	.87	.82	.79	.86	.76	.79	.79	.75	.86	.91
Weighted proportion of students attempting last item²	Nonpublic	.96	.89	.90	.93	.87	.89	.88	.88	.93	.98

Last updated 21 May 2017 (DC)

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