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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 Reading Combined National and State Main Assessment: 2003
Overall descriptive statistics for item blocks as defined after scaling, grade 8 reading combined national and state main assessment: 2003
Statistic Item type Block R3 Block R4 Block R5 Block R6 Block R7 Block R8 Block R9 Block R10 Block R11 Block R12 Block R131 Block R14 Block R15
Number of scaled items Total 10 9 11 12 13 10 9 12 12 10 13 10 10
Multiple choice 3 2 7 5 6 4 4 4 3 4 4 6 6
Dichotomously scored constructed response 4 2 3 5 6 2 1 7 8 2 1 2 0
Polytomously scored constructed response 3 5 1 2 1 4 4 1 1 4 8 2 4
Unweighted sample size 22,000 22,100 22,100 22,100 22,100 22,200 22,100 22,300 22,000 22,100 22,100 22,100 22,000
Weighted average item score 0.43 0.56 0.69 0.58 0.70 0.55 0.61 0.59 0.69 0.70 0.65 0.72 0.79
Weighted average polyserial 0.69 0.63 0.72 0.64 0.71 0.63 0.67 0.62 0.71 0.62 0.59 0.71 0.68
Weighted alpha reliability 0.76 0.70 0.77 0.72 0.78 0.71 0.68 0.73 0.79 0.68 0.72 0.69 0.65
Weighted proportion of students attempting last item2 0.82 0.85 0.95 0.87 0.84 0.87 0.96 0.77 0.87 0.92 0.95 0.86 0.96
† Not applicable.
1 A 50-minute block.
2 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), 2003 Reading Assessment.

Last updated 16 February 2009 (GF)

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