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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Overall Descriptive Statistics for Items as Defined After Scaling, Grade 4 Mathematics Combined National and State Main Assessment: 2007

Overall descriptive statistics for items as defined after scaling, grade 4 mathematics combined national and state main assessment: 2007
Statistic Item type Block M3 Block
M4
Block
M5
Block
M6
Block
M7
Block
M8
Block
M9
Block M10 Block M11 Block M12
† 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 Mathematics Assessment.
Number of scaled items Total 15 15 15 16 16 19 18 16 18 16
Multiple choice 10 11 7 13 11 13 10 12 15 12
Dichotomously scored constructed response 1 1 2 1 1 2 2 2 1 1
Polytomously scored constructed response 4 3 6 2 4 4 6 2 2 3
Unweighted sample size 39,200 39,100 39,400 39,900 39,800 39,000 39,900 39,900 39,300 39,300
Weighted average item score 0.50 0.53 0.52 0.59 0.50 0.56 0.59 0.57 0.61 0.52
Weighted average polyserial 0.61 0.59 0.57 0.61 0.55 0.53 0.61 0.60 0.60 0.56
Weighted alpha reliability 0.76 0.73 0.78 0.77 0.69 0.76 0.80 0.74 0.79 0.72
Weighted proportion of students attempting last item1 0.96 0.91 0.70 0.95 0.86 0.70 0.87 0.96 0.94 0.91

Last updated 02 March 2010 (JL)

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