NAEP Analysis and Scaling - Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment: 2003

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment: 2003

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 8 reading combined national and state main assessment: 2003
Statistic	Item type	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10	Block R11	Block R12	Block R13¹	Block R14	Block R15
Number of scaled items	Total	10	9	11	12	13	10	9	12	12	10	13	10	10
	Multiple choice	3	2	7	5	6	4	4	4	3	4	4	6	6
	Dichotomously scored constructed response	4	2	3	5	6	2	1	7	8	2	1	2	0
	Polytomously scored constructed response	3	5	1	2	1	4	4	1	1	4	8	2	4
Unweighted sample size	†	22,000	22,100	22,100	22,100	22,100	22,200	22,100	22,300	22,000	22,100	22,100	22,100	22,000
Weighted average item score	†	0.43	0.56	0.69	0.58	0.70	0.55	0.61	0.59	0.69	0.70	0.65	0.72	0.79
Weighted average polyserial	†	0.69	0.63	0.72	0.64	0.71	0.63	0.67	0.62	0.71	0.62	0.59	0.71	0.68
Weighted alpha reliability	†	0.76	0.70	0.77	0.72	0.78	0.71	0.68	0.73	0.79	0.68	0.72	0.69	0.65
Weighted proportion of students attempting last item²	†	0.82	0.85	0.95	0.87	0.84	0.87	0.96	0.77	0.87	0.92	0.95	0.86	0.96
† Not applicable. ¹ A 50-minute block. 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 Reading Assessment.

Last updated 16 February 2009 (GF)