NAEP tdw - Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 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 8 Reading Combined National and State Assessment, by Public and Nonpublic School Sessions: 2013

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 8 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	Block R11	Block R12	Block R13
† 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). NOTES: Blocks R1, R3, R6, R10, R11, and R12 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	†	10	10	10	10	10	10	10	10	10	10	11	10	10
Unweighted sample size	Public	24,900	22,900	24,900	23,000	23,100	25,100	23,000	23,000	22,900	24,300	24,300	25,000	22,800
Unweighted sample size	Nonpublic	500	500	500	500	500	500	400	400	400	500	500	500	400
Weighted average item score	Public	.65	.66	.61	.57	.75	.74	.77	.71	.68	.62	.69	.66	.63
Weighted average item score	Nonpublic	.74	.74	.69	.66	.83	.84	.81	.78	.75	.73	.77	.74	.74
Weighted average polyserial	Public	.63	.66	.63	.64	.70	.74	.71	.63	.67	.65	.66	.65	.69
Weighted average polyserial	Nonpublic	.61	.64	.64	.61	.77	.76	.76	.56	.65	.62	.64	.64	.72
Weighted alpha reliability	Public	.71	.72	.66	.68	.71	.73	.66	.61	.71	.71	.75	.71	.72
Weighted alpha reliability	Nonpublic	.61	.62	.65	.59	.66	.65	.57	.49	.67	.61	.69	.64	.68
Weighted proportion of students attempting last item²	Public	.84	.91	.96	.97	.95	.96	.94	.94	.94	.94	.92	.80	.93
Weighted proportion of students attempting last item²	Nonpublic	.94	.98	.98	.99	.97	.99	.97	.97	.97	.97	.95	.89	.99

Last updated 21 May 2017 (DC)

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