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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 4 Reading Combined National and State Main Assessment: 2002
Overall descriptive statistics for item blocks as defined after scaling, grade 4 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
Number of scaled items Total 9 12 11 9 10 10 9 12
Multiple choice 3 5 7 4 4 5 3 6
Dichotomously scored constructed response 4 6 3 1 5 0 3 5
Polytomously scored constructed response 2 1 1 4 1 5 3 1
Unweighted sample size 34,800 35,000 34,400 34,800 34,600 34,700 34,700 34,900
Weighted average item score 0.53 0.64 0.48 0.60 0.45 0.56 0.61 0.67
Weighted average polyserial 0.66 0.68 0.62 0.71 0.68 0.64 0.64 0.65
Weighted alpha reliability 0.70 0.79 0.75 0.78 0.75 0.74 0.72 0.76
Weighted proportion of students attempting last item1 0.73 0.66 0.76 0.68 0.66 0.69 0.69 0.83
† 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), 2002 Reading Assessment.

Last updated 16 February 2009 (GF)

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National Center for Education Statistics - http://nces.ed.gov
U.S. Department of Education