NAEP Analysis and Scaling - Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 12 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 12 Geography National Main Assessment (Accommodations Permitted [R3]): 2001

Overall descriptive statistics for item blocks as defined after scaling, grade 12 geography national main assessment (accommodations permitted [R3]): 2001
Statistic	Item type	Block G3	Block G4	Block G5	Block G6	Block G7	Block G8	Block G9
Number of scaled items	Total	16	17	17	16	15	16	22
	Multiple choice	11	12	11	12	11	10	15
	Dichotomously scored constructed response	0	0	2	0	0	1	3
	Polytomously scored constructed response	5	5	4	4	4	5	4
Unweighted sample size		2,300	2,300	2,200	2,300	2,300	2,300	2,300
Weighted average item score		0.55	0.49	0.65	0.56	0.44	0.38	0.51
Weighted average polyserial		0.60	0.53	0.64	0.56	0.55	0.60	0.59
Weighted alpha reliability		0.75	0.75	0.80	0.76	0.72	0.76	0.81
Weighted proportion of students attempting last item¹		0.95	0.88	0.98	0.94	0.60	0.74	0.99
¹The "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), 2001 Geography Assessment.

Last updated 10 July 2008 (GF)

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National Center for Education Statistics - http://nces.ed.gov
U.S. Department of Education

U.S. Department of Education
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National Center for Education Statistics