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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Scales → Scale Composition by Item Type for New and Trend Blocks → Block and Scale Composition, Grade 12 Science National Assessment: 2015

NAEP Technical DocumentationBlock and Scale Composition, Grade 12 Science National Assessment: 2015

Block composition before scaling, grade 12 science national assessment, by item type and block: 2015
Block	Total number of items	Number of multiple-choice items	Number of constructed-response items
Block	Total number of items	Number of multiple-choice items	2-category	3-category	4-category	5-category
Total	187	132	0	27	20	8
S3	17	11	0	3	1	2
S4	18	13	0	1	3	1
S5	17	12	0	3	2	0
S6	17	12	0	3	1	1
S7	17	11	0	4	2	0
S8	17	11	0	2	2	2
S9	19	16	0	2	1	0
S10	17	13	0	2	2	0
S11	16	11	0	3	2	0
S12	16	11	0	2	2	1
S13	16	11	0	2	2	1
NOTE: For a small number of constructed-response items, adjacent categories were combined. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Scale composition for new blocks as defined after scaling, grade 12 science national assessment, by item type and scale: 2015
Scale	Multiple-choice items		Dichotomously scored constructed-response items		Polytomously scored constructed-response items
Scale	Scaled	Dropped	Scaled	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Dropped
Univariate	29	0	0	0	4	1	2	0
NOTE: "Dropped" denotes items that were deleted from the final scaling. "Collapsed" denotes items that had categories that were combined and recoded for scaling. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Scale composition for trend blocks as defined after scaling, grade 12 science national assessment, by item type and scale: 2015
Scale	Multiple-choice items			Dichotomously scored constructed-response items			Polytomously scored constructed-response items
Scale	Concurrent	Split	Dropped	Concurrent	Split	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Split	Dropped
Univariate	95	3	7	0	0	0	28	9	8	7	0
NOTE: “Concurrent” denotes items that were scaled as the same items across assessment years. “Split” denotes items that were scaled as different items across assessment years. "Dropped" denotes items that were deleted from the final scaling. "Collapsed" denotes items that had categories that were combined and recoded for scaling. The number of concurrent polytomously scored constructed-response items is equal to the total number in the first three categories under "Polytomously scored constructed-response items". SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Scale composition for new blocks as defined after scaling, grade 12 science national assessment, by item type and subscale: 2015
Subscale	Multiple-choice items		Dichotomously scored constructed-response items		Polytomously scored constructed-response items
Subscale	Scaled	Dropped	Scaled	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Dropped
Total	29	0	0	0	6	1	0	0
Physical science	10	0	0	0	2	0	0	0
Earth and space sciences	5	0	0	0	2	0	0	0
Life science	14	0	0	0	2	1	0	0
NOTE: "Dropped" denotes items that were deleted from the final scaling. "Collapsed" denotes items that had categories that were combined and recoded for scaling. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Scale composition for trend blocks as defined after scaling, grade 12 science national assessment, by item type and subscale: 2015
Subscale	Multiple-choice items			Dichotomously scored constructed-response items			Polytomously scored constructed-response items
Subscale	Concurrent	Split	Dropped	Concurrent	Split	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Split	Dropped
Total	97	2	6	0	0	0	35	4	4	5	0
Physical Science	34	2	5	0	0	0	8	3	3	2	0
Earth and Space Sciences	24	0	0	0	0	0	10	0	1	2	0
Life Science	39	0	1	0	0	0	17	1	0	1	0
NOTE: “Concurrent” denotes items that were scaled as the same items across assessment years. “Split” denotes items that were scaled as different items across assessment years. "Dropped" denotes items that were deleted from the final scaling. "Collapsed" denotes items that had categories that were combined and recoded for scaling. The number of concurrent polytomously scored constructed-response items is equal to the total number in the first three categories under "Polytomously scored constructed-response items". SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Science Assessment.

Last updated 26 November 2021 (ML)

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