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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 Geography National Main Assessment (Accommodations Not Permitted [R2]): 2001
Overall descriptive statistics for item blocks as defined after scaling, grade 8 geography national main assessment (accommodations not permitted [R2]): 2001
Statistic Item type Block G3 Block G4 Block G5 Block G6 Block G7 Block G8 Block G9
Number of scaled items Total 17 16 17 16 14 17 25
Multiple choice 12 11 11 12 10 12 15
Dichotomously scored constructed response 0 1 1 0 0 2 3
Polytomously scored constructed response 5 4 5 4 4 3 7
Unweighted sample size 2,200 2,200 2,200 2,200 2,200 2,200 2,300
Weighted average item score 0.50 0.53 0.50 0.41 0.45 0.68 0.51
Weighted average polyserial 0.58 0.50 0.60 0.49 0.58 0.61 0.53
Weighted alpha reliability 0.76 0.67 0.78 0.69 0.74 0.76 0.80
Weighted proportion of students attempting last item1 0.98 0.96 0.97 0.90 0.73 0.94 0.99
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), 2001 Geography Assessment.

Last updated 10 July 2008 (FW)

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