NAEP Analysis and Scaling - Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 8 Mathematics Combined National and State Main Assessment: 2003

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 Mathematics Combined National and State Main Assessment: 2003

NAEP Technical DocumentationBlock-level descriptive statistics by public- and nonpublic-school sessions, as defined after scaling, grade 8 mathematics combined national and state main assessment: 2003
Statistic	Type of school¹	Block M3	Block M4	Block M5	Block M6	Block M7	Block M8	Block M9	Block M10	Block M11	Block M12
Number of scaled items		18	20	18	29	19	18	18	18	19	18
Unweighted sample size	Public	29,200	29,200	29,400	29,700	29,500	30,000	29,400	29,700	29,100	29,500
Unweighted sample size	Nonpublic	1,000	1,000	1,000	1,000	1,000	1,000	1,000	1,000	1,000	1,000
Weighted average item score	Public	0.53	0.61	0.58	0.64	0.48	0.51	0.47	0.51	0.53	0.54
Weighted average item score	Nonpublic	0.60	0.67	0.66	0.70	0.57	0.59	0.57	0.60	0.60	0.60
Weighted average polyserial	Public	0.60	0.62	0.62	0.59	0.59	0.60	0.58	0.63	0.57	0.56
Weighted average polyserial	Nonpublic	0.57	0.53	0.59	0.57	0.59	0.61	0.56	0.60	0.58	0.55
Weighted alpha reliability	Public	0.76	0.78	0.81	0.85	0.78	0.78	0.79	0.81	0.76	0.75
Weighted alpha reliability	Nonpublic	0.73	0.71	0.76	0.81	0.77	0.79	0.76	0.79	0.74	0.73
Weighted proportion of students attempting last item²	Public	0.93	0.69	0.88	0.92	0.90	0.85	0.77	0.85	0.95	0.92
Weighted proportion of students attempting last item²	Nonpublic	0.96	0.73	0.94	0.98	0.95	0.90	0.86	0.91	0.96	0.97
¹ Nonpublic-school sample includes only Catholic and private schools. ² 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), 2003 Mathematics Assessment.

Last updated 16 February 2009 (GF)