NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Scales → Scale Composition by Item Type for New and Trend Blocks → Science Assessment Subscale Composition for New and Previously Administered Blocks at Grade 8

NAEP Technical DocumentationScience Assessment Subscale Composition for New and Previously Administered Blocks at Grade 8

Each science assessment usually includes blocks of new items and blocks of items from previous assessments, although no new blocks were created for science in 2011. For the previously administered items in each science scale, the number of multiple-choice, dichotomously scored constructed-response, and polytomously scored constructed-response items are provided at grade 8. The item counts are available for each scale as defined in the final Item Response Theory (IRT) scales.

Subscale composition for previously administered blocks as defined after scaling, grade 8 science combined national and state assessments, by item type and subscale: 2011

Subscale	Multiple-choice items			Dichotomously scored constructed-response items			Polytomously scored constructed-response items
	Concurrent	Split	Dropped	Concurrent	Split	Dropped	Polytomous uncollapsed	Dichotomous collapsed	Polytomous collapsed	Split	Dropped
NOTE: "Concurrent" denotes items that were scaled as the same items across assessment years. "Split" denotes items that were scaled as different items in each assessment year. "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), 2011 Science Assessment.
Total	94	0	4	1	0	0	39	1	6	3	1
Physical science	29	0	4	1	0	0	10	0	0	1	1
Earth and space sciences	39	0	0	0	0	0	15	0	3	2	0
Life science	26	0	0	0	0	0	14	1	3	0	0

Scale composition for previously administered blocks as defined after scaling, grade 8 science combined national and state assessments, by item type and scale: 2011

Scale	Multiple-choice items			Dichotomously scored constructed-response items			Polytomously scored constructed-response items
	Concurrent	Split	Dropped	Concurrent	Split	Dropped	Polytomous uncollapsed	Dichotomous collapsed	Polytomous collapsed	Split	Dropped
1 Single overall scale. NOTE: "Concurrent" denotes items that were scaled as the same items across assessment years. "Split" denotes items that were scaled as different items in each assessment year. "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), 2011 Science Assessment.
Total	94	0	4	1	0	0	35	2	9	3	1
One Scale1	94	0	4	1	0	0	35	2	9	3	1

Block composition, grade 8 science combined national and state assessments, by item type and block: 2011

Block	Total number of items	Number of multiple-choice items	Number of constructed-response items
			2-category	3-category	4-category	5-category
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), 2011 Science Assessment.
Total	149	98	1	19	19	12
S3	17	12	0	1	2	2
S4	18	13	0	2	1	2
S5	18	13	0	2	2	1
S6	17	11	0	4	1	1
S7	16	10	0	1	2	3
S8	18	13	1	1	2	1
S9	14	8	0	1	5	0
S11	16	9	0	3	3	1
S12	15	9	0	4	1	1

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