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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined After Scaling, Grade 4 Reading Combined National and State Assessment, by Public and Nonpublic School Sessions: 2013
NAEP Technical DocumentationBlock-level descriptive statistics as defined after scaling, grade 4 reading combined national and state assessment, by public and nonpublic school sessions: 2013
StatisticType of school1 Block R1Block R2Block R3Block R4Block R5Block R6Block R7Block R8Block R9Block R10
† Not applicable.
1 Nonpublic school sample includes only private schools, including Catholic schools.
2The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item/100).
NOTE: Blocks R1, R2, R4, R6, R7, and R9 have larger sample sizes due to their pairing with integrated pilot blocks.
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Reading Assessment.
Number of scaled items†11811101010101098
Unweighted sample size Public35,00035,00032,50035,00032,70034,20035,10032,60034,20032,600
Nonpublic600600500600600600600600600600
Weighted average item scorePublic.67.64.63.57.49.51.57.51.59.56
Nonpublic.76.70.70.64.55.57.65.57.68.63
Weighted average polyserialPublic.66.68.63.69.63.66.63.63.69.64
Nonpublic.66.66.58.65.63.67.64.61.69.63
Weighted alpha reliabilityPublic.75.68.72.75.71.74.71.70.73.59
Nonpublic.66.61.58.67.70.74.66.65.69.54
Weighted proportion of students attempting last item2Public.87.82.79.86.76.79.79.75.86.91
Nonpublic.96.89.90.93.87.89.88.88.93.98
Last updated 21 May 2017 (DC)