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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 Economics National Main Assessment: 2006

NAEP Technical DocumentationOverall descriptive statistics for item blocks as defined after scaling, grade 12 economics national main assessment: 2006

Statistic	Block E1	Block E2	Block E3	Block E4	Block E5	Block E6	Block E7	Block E8	Block E9	Block E10
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), 2006 Economics Assessment.
Total number of scaled items	17.00	18.00	19.00	18.00	21.00	18.00	18.00	20.00	20.00	18.00
Number of multiple-choice items	13.00	15.00	15.00	15.00	18.00	15.00	15.00	17.00	17.00	15.00
Number of dichtomously scored constructed-response items	0	0	1.00	0	0	0	0	1.00	1.00	0
Number of polytomously scored constructed-response items	4.00	3.00	3.00	3.00	3.00	3.00	3.00	2.00	2.00	3.00
Unweighted sample size	2,300	2,300	2,300	2,300	2,300	2,200	2,300	2,300	2,300	2,300
Weighted average item score	0.48	0.59	0.55	0.49	0.51	0.54	0.59	0.50	0.54	0.50
Weighted average polyserial	0.53	0.55	0.54	0.52	0.49	0.52	0.57	0.54	0.55	0.49
Weighted alpha reliability	0.73	0.74	0.75	0.71	0.74	0.69	0.76	0.75	0.77	0.69
Weighted proportion of students attempting last item1	0.99	0.98	0.97	0.97	0.97	0.98	0.98	0.98	0.97	0.98

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