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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: 2002
Overall descriptive statistics for item blocks as defined after scaling, grade 8 reading combined national and state main assessment: 2002
Statistic Item type Block R3  Block R4  Block R5  Block R6  Block R7  Block R8  Block R9  Block R10  Block R11  Block R131
Number of scaled items Total 10 9 11 12 13 10 9 12 12 13
Multiple choice 3 2 7 5 6 4 4 4 3 4
Dichotomously scored constructed response 3 2 3 5 6 2 1 7 8 1
Polytomously scored constructed response 4 5 1 2 1 4 4 1 1 8
Unweighted sample size 20,900 20,800 20,800 20,800 20,900 21,000 20,800 21,000 20,800 21,000
Weighted average item score 0.43 0.56 0.70 0.58 0.71 0.55 0.61 0.62 0.70 0.66
Weighted average polyserial 0.69 0.60 0.74 0.62 0.72 0.61 0.67 0.60 0.71 0.60
Weighted alpha reliability 0.76 0.67 0.78 0.71 0.78 0.69 0.68 0.73 0.80 0.72
Weighted proportion of students attempting last item2 0.79 0.83 0.94 0.87 0.83 0.84 .95 0.75 0.84 0.93
† 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), 2002 Reading Assessment.

Last updated 16 February 2009 (GF)

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