Table of Contents  |  Search Technical Documentation  |  References

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 4 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 4 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
Number of scaled items	†	9	12	11	9	10	10	9	12
Unweighted sample size	Public	33,100	33,400	32,800	33,200	32,900	33,100	33,000	33,200
	Nonpublic	1,400	1,400	1,400	1,400	1,400	1,400	1,400	1,400
Weighted average item score	Public	0.53	0.64	0.47	0.59	0.44	0.55	0.60	0.66
	Nonpublic	0.62	0.72	0.55	0.68	0.54	0.63	0.66	0.73
Weighted average polyserial	Public	0.66	0.68	0.62	0.71	0.69	0.64	0.64	0.65
	Nonpublic	0.62	0.67	0.62	0.71	0.64	0.62	0.62	0.62
Weighted alpha reliability	Public	0.70	0.80	0.74	0.78	0.75	0.74	0.73	0.77
	Nonpublic	0.63	0.73	0.73	0.75	0.70	0.70	0.66	0.69
Weighted proportion of students attempting last item2	Public	0.72	0.65	0.75	0.67	0.65	0.68	0.68	0.82
	Nonpublic	0.85	0.79	0.87	0.80	0.75	0.79	0.79	0.90
† Not applicable. 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), 2002 Reading Assessment.

Printer-friendly Version