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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 → Subscale Composition by Item Type for New and Trend Blocks in the Science Assessment at Grade 4: 2000

NAEP Technical DocumentationSubscale Composition by Item Type for New and Trend Blocks in the Science Assessment at Grade 4: 2000

Each assessment includes blocks of new items and blocks of items from previous assessments. For the new items and for the trend items in each subject area scale, the number of multiple-choice, dichotomously scored constructed-response and polytomously scored constructed-response items are provided for each grade level. The item counts are available for each scale as defined in the final Item Response Theory (IRT) scales. They are provided for samples for which accommodations were permitted and for samples for which accommodations were not permitted.

Subscale composition by item type for new blocks as defined after scaling, grade 4 science assessment (accommodations permitted [R3]): 2000

Subscale	Multiple-choice items		Dichotomously scored constructed-response items		Polytomously scored constructed-response items
	Scaled	Dropped	Scaled	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Dropped
Total	33	1	0	0	7	3	0	0
Physical science	6	0	0	0	4	1	0	0
Earth science	9	0	0	0	2	0	0	0
Life science	18	1	0	0	1	2	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), 2000 Science Assessment.

Subscale composition by item type for new blocks as defined after scaling, grade 4 science assessment (accommodations permitted [R2]): 2000

Subscale	Multiple-choice items		Dichotomously scored constructed-response items		Polytomously scored constructed-response items
	Scaled	Dropped	Scaled	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Dropped
Total	33	1	0	0	7	3	0	0
Physical science	6	0	0	0	4	1	0	0
Earth science	9	0	0	0	2	0	0	0
Life science	18	1	0	0	1	2	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), 2000 Science Assessment.

Year Subscale composition by item type for previously administered blocks as defined after scaling, grade 4 science assessment (accommodations permitted [R3]): 2000

Subscale	Multiple-choice items			Dichotomously scored constructed-response items			Polytomously scored constructed-response items
	Scaled			Scaled			Scaled
	Concurrent	Split	Dropped	Concurrent	Split	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Split	Dropped
Total	30	2	1	3	2	0	38	13	4	6	1
Physical science	10	0	0	3	1	0	14	31	1	41	1
Earth science	13	1	0	0	0	0	13	6	2	0	0
Life science	7	1	1	0	1	0	11	4	1	2	0
1 One item is both trend —”Dichotomous collapsed” and “Split.”
NOTE: "Concurrent" denotes items that were scaled as common 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), 2000 Science Assessment.

Year Subscale composition by item type for previously administered blocks as defined after scaling, grade 4 science assessment (accommodations permitted [R2]): 2000

Subscale	Multiple-choice items			Dichotomously scored constructed-response items			Polytomously scored constructed-response items
	Scaled			Scaled			Scaled
	Concurrent	Split	Dropped	Concurrent	Split	Dropped	Polytomous (uncollapsed)	Dichotomous collapsed	Polytomous collapsed	Split	Dropped
Total	30	2	1	3	2	0	41	12	3	6	1
Physical science	10	0	0	3	1	0	15	3	1	4	1
Earth science	13	1	0	0	0	0	14	6	1	0	0
Life science	7	1	1	0	1	0	12	3	1	2	0
NOTE: "Concurrent" denotes items that were scaled as common 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), 2000 Science Assessment.

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