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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

Overall 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

Last updated 23 June 2010 (GF)

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National Center for Education Statistics - http://nces.ed.gov
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