NAEP Analysis and Scaling - Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 Reading Combined National and State Main Assessment: 2002

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: 2002

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 4 reading combined national and state main assessment: 2002
Statistic	Item type	Block R3	Block R4	Block R5	Block R6	Block R7	Block R8	Block R9	Block R10
Number of scaled items	Total	9	12	11	9	10	10	9	12
	Multiple choice	3	5	7	4	4	5	3	6
	Dichotomously scored constructed response	4	6	3	1	5	0	3	5
	Polytomously scored constructed response	2	1	1	4	1	5	3	1
Unweighted sample size	†	34,800	35,000	34,400	34,800	34,600	34,700	34,700	34,900
Weighted average item score	†	0.53	0.64	0.48	0.60	0.45	0.56	0.61	0.67
Weighted average polyserial	†	0.66	0.68	0.62	0.71	0.68	0.64	0.64	0.65
Weighted alpha reliability	†	0.70	0.79	0.75	0.78	0.75	0.74	0.72	0.76
Weighted proportion of students attempting last item¹	†	0.73	0.66	0.76	0.68	0.66	0.69	0.69	0.83
† 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), 2002 Reading Assessment.

Last updated 16 February 2009 (GF)