NAEP Analysis and Scaling - Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment: 2002

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment: 2002

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 reading combined national and state main assessment: 2002
Statistic	Type of school¹	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10	Block R11	Block R13²
Number of scaled items	†	10	9	11	12	13	10	9	12	12	13
Unweighted sample size	Public	19,800	19,700	19,800	19,800	19,800	19,900	19,800	19,900	19,700	19,900
Unweighted sample size	Nonpublic	1,000	900	1,000	1,000	900	1,000	1,000	1,000	1,000	1,000
Weighted average item score	Public	0.42	0.56	0.69	0.57	0.70	0.54	0.61	0.61	0.69	0.65
Weighted average item score	Nonpublic	0.51	0.62	0.79	0.67	0.79	0.63	0.69	0.70	0.77	0.72
Weighted average polyserial	Public	0.69	0.61	0.74	0.62	0.72	0.61	0.67	0.60	0.71	0.60
Weighted average polyserial	Nonpublic	0.65	0.56	0.76	0.57	0.70	0.57	0.64	0.56	0.68	0.55
Weighted alpha reliability	Public	0.77	0.67	0.79	0.71	0.79	0.70	0.68	0.73	0.80	0.72
Weighted alpha reliability	Nonpublic	0.72	0.59	0.74	0.58	0.69	0.58	0.59	0.66	0.72	0.60
Weighted proportion of students attempting last item³	Public	0.79	0.83	0.94	0.86	0.83	0.84	0.95	0.75	0.83	0.93
Weighted proportion of students attempting last item³	Nonpublic	0.86	0.88	0.97	0.93	0.90	0.89	0.97	0.78	0.88	0.97
† Not applicable. ¹ Nonpublic-school sample includes only Catholic and private schools. ² A 50-minute block. ³ The "Weighted proportion of students attempting last item" is equal to 1 - (Percent not responding to last item /100). 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), 2002 Reading Assessment.

Last updated 16 February 2009 (GF)