NAEP Analysis and Scaling - Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 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 4 Reading Combined National and State Main Assessment: 2003

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 4 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
Number of scaled items	Total	9	12	11	9	10	10	9	12	10	10
	Multiple choice	3	5	7	4	4	5	3	6	6	6
	Dichotomously scored constructed response	4	5	3	2	5	0	2	5	2	2
	Polytomously scored constructed response	2	2	1	3	1	5	4	1	2	2
Unweighted sample size	†	37,000	37,200	37,100	37,500	37,200	37,000	37,100	37,500	37,500	37,200
Weighted average item score	†	0.53	0.64	0.47	0.63	0.44	0.54	0.61	0.66	0.75	0.61
Weighted average polyserial	†	0.66	0.68	0.62	0.72	0.69	0.65	0.66	0.66	0.75	0.69
Weighted alpha reliability	†	0.69	0.79	0.73	0.78	0.74	0.74	0.73	0.76	0.72	0.74
Weighted proportion of students attempting last item¹	†	0.76	0.68	0.76	0.71	0.68	0.73	0.71	0.85	0.88	0.85
† Not applicable. ¹ 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)