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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 8 Reading Combined National and State Main Assessment: 2007

Overall descriptive statistics for items as defined after scaling, grade 8 reading combined national and state main assessment: 2007
Statistic Item type Block R3 Block R4 Block R5 Block R6 Block R7 Block R8 Block R9 Block R10 Block R11 Block R12 Block R13 Block R14 Block R15
† Not applicable. 
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), 2007 Reading Assessment.
Number of scaled items Total 10 9 11 12 10 11 10 12 12 10 13 10 10
Multiple choice 3 5 7 5 5 6 6 4 3 5 4 6 6
Dichotomously scored constructed response 4 0 3 5 0 3 1 7 8 1 2 2 0
Polytomously scored constructed response 3 4 1 2 5 2 3 1 1 4 7 2 4
Unweighted sample size 23,900 24,100 23,900 23,900 24,000 24,100 24,000 24,100 24,000 24,000 16,100 24,000 24,100
Weighted average item score 0.42 0.63 0.69 0.58 0.75 0.72 0.72 0.57 0.68 0.67 0.64 0.73 0.79
Weighted average polyserial 0.68 0.66 0.71 0.63 0.66 0.66 0.75 0.62 0.67 0.71 0.59 0.69 0.69
Weighted alpha reliability 0.74 0.66 0.76 0.71 0.67 0.69 0.75 0.73 0.76 0.76 0.73 0.68 0.66
Weighted proportion of students attempting last item1 0.82 0.91 0.95 0.89 0.97 0.95 0.99 0.77 0.87 0.95 0.92 0.86 0.96

Last updated 02 March 2010 (JL)

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