NAEP Analysis and Scaling - Block-Level Descriptive Statistics by Public- and Nonpublic-School Sessions, as Defined After Scaling, Grade 4 Reading Combined National and State Main Assessment: 2005

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: 2005

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: 2005
Statistic	Type of school¹	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10	Block R11	Block R12
Number of scaled items	†	9	10	11	9	10	10	10	10	10	10
Unweighted sample size	Public	32,000	30,400	31,600	30,200	31,900	30,400	32,100	30,500	32,100	30,200
Unweighted sample size	Nonpublic	1,200	1,200	1,200	1,300	1,300	1,300	1,300	1,200	1,200	1,200
Weighted average item score	Public	0.52	0.70	0.46	0.62	0.43	0.54	0.78	0.61	0.75	0.61
Weighted average item score	Nonpublic	0.62	0.80	0.56	0.70	0.52	0.62	0.84	0.72	0.81	0.69
Weighted average polyserial	Public	0.66	0.76	0.61	0.72	0.68	0.63	0.71	0.67	0.75	0.69
Weighted average polyserial	Nonpublic	0.64	0.79	0.63	0.69	0.67	0.62	0.66	0.65	0.73	0.69
Weighted alpha reliability	Public	0.68	0.79	0.73	0.77	0.72	0.72	0.74	0.76	0.72	0.74
Weighted alpha reliability	Nonpublic	0.64	0.74	0.73	0.70	0.72	0.68	0.65	0.69	0.60	0.71
Weighted proportion of students attempting last item²	Public	0.76	0.84	0.76	0.71	0.68	0.73	0.82	0.83	0.88	0.85
Weighted proportion of students attempting last item²	Nonpublic	0.86	0.94	0.86	0.80	0.77	0.84	0.91	0.92	0.93	0.91
† 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), 2005 Reading Assessment.

Last updated 23 March 2009 (GF)