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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 Mathematics State Assessment (Accommodations Not Permitted [R2]): 2000
Overall descriptive statistics for item blocks as defined after scaling, grade 8 mathematics state assessment (accommodations not permitted [R2]): 2000
Statistic Item type Block M3 Block M4 Block M5 Block M6 Block M7 Block M8 Block M9 Block M10 Block M11 Block M12 Block M13 Block M14 Block M15
Number of scaled items Total 9 21 12 15 10 18 9 9 19 9 11 10 9
Multiple choice 6 21 7 0 4 16 5 6 13 6 6 6 3
Dichotomously scored constructed response 0 0 1 14 1 2 3 1 6 0 4 1 1
Polytomously scored constructed response 3 0 4 1 5 0 1 2 0 3 1 3 5
Unweighted sample size 21,100 21,100 21,200 21,200 21,100 21,100 21,200 21,300 21,200 21,100 21,200 21,100 21,100
Weighted average item score 0.39 0.60 0.56 0.60 0.59 0.52 0.35 0.53 0.65 0.42 0.51 0.46 0.42
Weighted average polyserial 0.58 0.56 0.63 0.68 0.66 0.61 0.61 0.63 0.67 0.66 0.63 0.54 0.69
Weighted alpha reliability 0.53 0.77 0.71 0.81 0.70 0.79 0.60 0.64 0.82 0.63 0.69 0.59 0.72
Weighted proportion of students attempting last item1 0.92 0.87 0.97 0.94 0.81 0.70 0.95 0.94 0.89 0.95 0.98 0.78 0.86
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), 2000 Mathematics Assessment.

Last updated 11 July 2008 (DB)

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