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NAEP Analysis and Scaling → Initial Activities → Classical Item Analysis → Block-Level Descriptive Statistics as Defined after Scaling, Grade 12 Reading National Assessment, by Block and School Type: 2019

​​NAEP Technical DocumentationBlock-Level Descriptive Statistics as Defined after Scaling, Grade 12 Reading National Assessment, by Block and School Type: 2019

Block-level descriptive statistics as defined after scaling, grade 12 reading DBA national assessment, by block and school type: 2019
Statistic Block R1 Block R2 Block R3 Block R4 Block R5 Block R6 Block R7 Block R8 Block R9 Block R10 Block R11 Block R12 Block R13 Block R15 Block R16
The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items.
The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). Weights are applied to reflect sampling design.
DBA = Digitally based assessment. The nonpublic school sample includes only private schools, including Catholic schools. BIE and DoDEA schools are not included in either the public or nonpublic category. Item statistics in this table are described on the page Blocks of Items.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Reading Assessment.
Number of scaled items 9 10 10 10 9 10 11 10 9 10 11 11 10 9 8
Public school
Unweighted sample size 1,700 1,700 1,700 1,700 1,700 1,700 1,700 1,700 1,800 1,800 1,700 1,700 1,700 1,700 1,800
Weighted average item score .66 .71 .70 .59 .54 .53 .63 .62 .57 .56 .54 .59 .60 .39 .53
Weighted average R biserial/polyserial .75 .76 .77 .71 .76 .65 .73 .76 .71 .71 .73 .74 .70 .65 .71
Weighted alpha reliability .78 .78 .77 .77 .77 .70 .78 .80 .77 .79 .81 .82 .75 .71 .82
Weighted proportion of students attempting last item .93 .95 .99 .86 .98 .99 .99 .89 .98 .91 .98 .97 .98 .94 .85
Nonpublic school
Unweighted sample size 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100
Weighted average item score .75 .77 .75 .71 .64 .57 .75 .76 .68 .67 .65 .69 .67 .44 .64
Weighted average R biserial/polyserial .79 .62 .82 .76 .74 .62 .76 .70 .64 .69 .63 .66 .65 .62 .64
Weighted alpha reliability .78 .61 .75 .74 .73 .66 .76 .66 .67 .72 .69 .73 .69 .68 .76
Weighted proportion of students attempting last item .90 .97 1.00 .95 1.00 1.00 .94 .96 .99 .99 .99 .98 .98 .99 .88
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Block-level descriptive statistics as defined after scaling, grade 12 reading PBA national assessment, by block and school type: 2019
StatisticBlock R1Block R2Block R3Block R4Block R5Block R6Block R7Block R8Block R9Block R10Block R11Block R12Block R13
The "Weighted average item score" of polytomous items is standardized to have a scale of 0 to 1 so they are comparable to dichotomously scored items.
The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100). Weights are applied to reflect sampling design.
PBA = Paper-based assessment. The nonpublic school sample includes only private schools, including Catholic schools. BIE and DoDEA schools are not included in either the public or nonpublic category. Item statistics in this table are described on the page Blocks of Items.
U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2019 Reading Assessment.
Number of scaled items101010109101110910111111
Public school
Unweighted sample size1,9001,9001,9001,8001,9001,8001,9001,9001,8001,8001,9001,9001,800
Weighted average item score.70.73.72.61.56.56.63.65.56.59.57.66.55
Weighted average R biserial/polyserial.70.74.69.71.75.66.71.76.67.68.72.72.66
Weighted alpha reliability.75.76.70.76.76.72.77.78.75.76.80.78.74
Weighted proportion of students attempting last item.89.93.98.83.96.96.95.85.93.88.97.95.88
Nonpublic school
Unweighted sample size100100100100100100100100100100100100100
Weighted average item score.77.79.79.71.63.65.73.70.64.65.70.74.59
Weighted average R biserial/polyserial.77.68.75.66.74.73.68.77.66.72.82.81.72
Weighted alpha reliability.76.62.69.68.75.75.64.75.73.77.82.81.76
Weighted proportion of students attempting last item.92.991.00.89.96.98.96.95.93.96.98.99.96
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Last updated 05 October 2023 (SK)