NAEP Analysis and Scaling - Block-Level Descriptive Statistics as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment, by Public and Nonpublic School Sessions: 2009

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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 Main Assessment, by Public and Nonpublic School Sessions: 2009

NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 8 reading combined national and state main assessment, by public and nonpublic school sessions: 2009
Statistic	Type of School¹	Block F3	Block F4	Block F5	Block F6	Block F7	Block F8	Block F9	Block F10	Block F11	Block F12	Block F14	Block F15	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. ¹Nonpublic school sample includes only Private and 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), 2009 Reading Assessment.
Number of scaled items	†	10	9	11	12	10	11	10	12	12	10	10	10	10	10	10	10	10	10	10	10	10	9	11	11	9
Unweighted sample size	Public	13,600	13,500	13,500	12,900	13,000	12,900	13,500	13,500	12,900	12,900	12,900	13,500	11,400	11,400	11,300	11,300	11,500	11,400	11,300	11,400	11,400	11,300	11,300	11,400	11,400
Unweighted sample size	Nonpublic	300	300	300	300	300	300	300	300	300	200	200	300	200	200	200	200	200	200	200	200	200	200	200	200	200
Weighted average item score	Public	0.42	0.63	0.68	0.58	0.74	0.72	0.72	0.56	0.67	0.67	0.73	0.79	0.63	0.49	0.59	0.56	0.74	0.73	0.75	0.69	0.68	0.59	0.59	0.62	0.66
Weighted average item score	Nonpublic	0.54	0.70	0.80	0.65	0.82	0.81	0.81	0.68	0.77	0.78	0.83	0.86	0.73	0.57	0.69	0.64	0.83	0.82	0.83	0.74	0.78	0.71	0.69	0.71	0.76
Weighted average polyserial	Public	0.68	0.67	0.72	0.64	0.66	0.65	0.75	0.63	0.66	0.71	0.71	0.67	0.64	0.64	0.63	0.63	0.72	0.73	0.71	0.65	0.69	0.65	0.60	0.66	0.65
Weighted average polyserial	Nonpublic	0.59	0.60	0.76	0.57	0.54	0.66	0.69	0.53	0.63	0.72	0.69	0.64	0.61	0.61	0.63	0.59	0.67	0.74	0.76	0.64	0.61	0.60	0.61	0.66	0.61
Weighted alpha reliability	Public	0.75	0.67	0.77	0.72	0.66	0.67	0.75	0.74	0.75	0.76	0.69	0.65	0.72	0.70	0.67	0.67	0.73	0.73	0.67	0.65	0.73	0.70	0.71	0.73	0.67
Weighted alpha reliability	Nonpublic	0.64	0.51	0.71	0.56	0.39	0.60	0.61	0.60	0.64	0.72	0.51	0.44	0.64	0.66	0.62	0.56	0.52	0.63	0.54	0.56	0.55	0.56	0.69	0.70	0.55
Weighted proportion of students attempting last item²	Public	0.83	0.91	0.94	0.89	0.97	0.95	0.99	0.78	0.87	0.96	0.86	0.96	0.84	0.92	0.96	0.97	0.96	0.97	0.95	0.94	0.95	0.97	0.74	0.88	0.93
Weighted proportion of students attempting last item²	Nonpublic	0.85	0.95	0.98	0.96	0.98	0.96	0.99	0.87	0.92	0.98	0.94	0.99	0.89	0.94	0.98	0.99	0.97	0.99	0.94	0.97	0.98	0.96	0.81	0.91	0.98

Last updated 05 January 2016 (GF)

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