NAEP tdw - Block-Level Descriptive Statistics as Defined After Scaling, Grade 12 Reading Combined National and State Assessment, by Public and Nonpublic School Sessions: 2013

Home TDW NAEP Analysis and Scaling Initial Activities Classical Item AnalysisBlock-Level Descriptive Statistics as Defined After Scaling, Grade 12 Reading Combined National and State Assessment, by Public and Nonpublic School Sessions: 2013

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 12 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
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). 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	9	10	11	10	9	10	10	11	11
Unweighted sample size	Public	6,400	6,300	6,400	6,300	6,300	6,300	6,300	6,300	6,300	6,300	6,300	6,400	6,300
Unweighted sample size	Nonpublic	200	200	200	200	200	200	200	200	200	200	200	200	200
Weighted average item score	Public	.71	.73	.73	.68	.57	.58	.65	.66	.59	.59	.56	.67	.55
Weighted average item score	Nonpublic	.78	.80	.80	.73	.65	.65	.72	.73	.68	.70	.64	.74	.63
Weighted average polyserial	Public	.67	.71	.69	.70	.72	.63	.67	.73	.67	.66	.62	.71	.63
Weighted average polyserial	Nonpublic	.64	.71	.66	.69	.67	.66	.68	.72	.68	.67	.67	.77	.65
Weighted alpha reliability	Public	.70	.72	.68	.71	.73	.68	.72	.75	.73	.73	.69	.77	.69
Weighted alpha reliability	Nonpublic	.64	.69	.57	.65	.65	.70	.68	.69	.73	.73	.71	.77	.71
Weighted proportion of students attempting last item²	Public	.90	.94	.99	.99	.96	.97	.97	.86	.95	.91	.95	.96	.88
Weighted proportion of students attempting last item²	Nonpublic	.93	.97	.99	.99	.96	.97	.99	.94	.94	.93	.98	.98	.94

Last updated 21 May 2017 (DC)