NAEP Analysis and Scaling - Overall Descriptive Statistics for Items as Defined After Scaling, Grade 12 Economics Assessment: 2012

NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 12 Economics National Assessment, By Block: 2012

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 12 economics national assessment, by block: 2012
Statistic	Item type	Block E1	Block E2	Block E3	Block E4	Block E5	Block E6	Block E7	Block E8	Block E9	Block E10
† 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. In 2012 grades 4 and 8 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2012 Economics Assessment.
Number of scaled items	Total	20	21	19	19	20	17	18	20	20	18
	Multiple choice	16	18	15	16	17	14	15	17	17	15
	Dichtomously scored constructed response	0	0	1	0	0	0	0	1	1	0
	Polytomously scored constructed response	4	3	3	3	3	3	3	2	2	3
Unweighted sample size	†	2,200	2,200	2,200	2,200	2,200	2,100	2,200	2,200	2,200	2,200
Weighted average item score	†	0.55	0.55	0.54	0.59	0.54	0.56	0.59	0.50	0.54	0.52
Weighted average polyserial	†	0.53	0.53	0.54	0.55	0.51	0.54	0.56	0.53	0.54	0.48
Weighted alpha reliability	†	0.76	0.77	0.74	0.77	0.75	0.71	0.75	0.75	0.76	0.67
Weighted proportion of students attempting last item¹	†	0.97	0.96	0.97	0.93	0.97	0.98	0.98	0.97	0.97	0.98

Last updated 30 June 2014 (GF)