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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 4 Reading Combined National and State Main Assessment: 2007
Overall descriptive statistics for items as defined after scaling, grade 4 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
† 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 10 11 9 10 10 10 10 10 10
Multiple choice 6 6 7 4 5 6 5 6 6 6
Dichotomously scored constructed response 0 2 3 2 1 0 3 1 2 2
Polytomously scored constructed response 4 2 1 3 4 4 2 3 2 2
Unweighted sample size 38,200 37,900 37,600 37,900 38,000 38,000 38,400 38,000 38,000 38,000
Weighted average item score 0.67 0.72 0.47 0.65 0.51 0.59 0.78 0.64 0.77 0.64
Weighted average polyserial 0.68 0.77 0.60 0.71 0.62 0.70 0.71 0.66 0.76 0.69
Weighted alpha reliability 0.74 0.79 0.72 0.76 0.70 0.76 0.73 0.75 0.71 0.74
Weighted proportion of students attempting last item1 0.87 0.83 0.77 0.72 0.81 0.80 0.83 0.82 0.90 0.86

Last updated 02 March 2010 (JL)

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