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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 U.S. History National Assessment, by Block and Item Type: 2018

NAEP Technical DocumentationOverall Descriptive Statistics for Item Blocks as Defined After Scaling, Grade 8 U.S. History National Assessment, by Block and Item Type: 2018

Overall descriptive statistics for item blocks as defined after scaling, grade 8 U.S. history DBA national assessment, by block and item type: 2018
Statistic
Item type
Block H1Block H2Block H3Block H4Block H5Block H6Block H7Block H8Block H9
Number of scaled items
 Total 23 20 21 23 22 22 22 19 21
Multiple choice171415171616131015
Dichotomously scored constructed-response100200131
Polytomously scored constructed-response
566466865
Unweighted sample size†1,9001,8001,8001,8001,9001,8001,8001,8001,900
Weighted average item score1†.51.48.48.45.49.47.49.43.49
Weighted average polyserial†.53.52.54.50.52.54.49.53.52
Weighted alpha reliability†.79.79.81.79.81.81.76.74.78
Weighted proportion of students attempting last item2†.87.91.89.76.83.88.87.87.87
† Not applicable.
1 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.
2 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100).
NOTE: DBA = Digitally based assessment. Item statistics in this table are described on the page Blocks of Items. The block naming conventions used in this table are described in the document 2018 Block Naming Conventions in Data Products and TDW PDF File .
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2018 U.S. History Assessment.


Overall descriptive statistics for item blocks as defined after scaling, grade 8 U.S. history PBA national assessment, by block and item type: 2018
Statistic
Item type
Block H3Block H4Block H5Block H6Block H7Block H8Block H9Block H10Block H11Block H12
Number of scaled items
 Total 17 16 17 16 16 17 16 16 16 16
Multiple choice12111211121311111111
Dichotomously scored constructed-response0001000100
Polytomously scored constructed-response5554445455
Unweighted sample size
†
1,7001,6001,6001,6001,6001,6001,6001,6001,6001,600
Weighted average item score1
†
.56.46.44.45.50.49.39.40.38.47
Weighted average polyserial
†
.57.53.59.53.57.52.54.51.51.56
Weighted alpha reliability
†
.75.75.77.74.76.75.73.68.70.77
Weighted proportion of students attempting last item2
†
.91.92.83.90.93.84.87.83.91.91
† Not applicable.
1 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.
2 The "Weighted proportion of students attempting last item" is equal to 1 – (Percent not responding to last item / 100).
NOTE: PBA = Paper-based assessment. Item statistics in this table are described on the page Blocks of Items. The block naming conventions used in this table are described in the document 2018 Block Naming Conventions in Data Products and TDW PDF File .
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2018 U.S. History Assessment.




Last updated 20 December 2022 (PG)