NAEP Technical DocumentationBlock and Scale Composition, Grade 8 Vocabulary National Assessment: 2015

Block composition before scaling, grade 8 vocabulary national assessment, by item type and block: 2015

Block	Total number of items	Number of multiple-choice items	Number of constructed-response items
			2-category	3-category	4-category	5-category
Total	57	57	0	0	0	0
R14	6	6	0	0	0	0
R15	5	5	0	0	0	0
R16	5	5	0	0	0	0
R17	5	5	0	0	0	0
R18	6	6	0	0	0	0
R19	6	6	0	0	0	0
Embedded	24	24	0	0	0	0
NOTE: Single overall scale. The vocabulary assessment includes multiple-choice items only. The item counts include vocabulary items from both the half-blocks as well as the vocabulary items embedded within the 25-minute reading comprehension blocks. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Reading Assessment.

Scale composition of new blocks as defined after scaling, grade 8 vocabulary national assessment, by item type and scale: 2015

Scale	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	12	0	0	0	0	0	0	0
NOTE: Single overall scale. The vocabulary assessment includes multiple-choice items only. The item counts include vocabulary items from both the half-blocks as well as the vocabulary items embedded within the 25-minute reading comprehension blocks. "Dropped" denotes items that were deleted from the final scaling. "Collapsed" denotes items that had categories that were combined and recoded. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Reading Assessment.

Scale composition of trend blocks as defined after scaling, grade 8 vocabulary national assessment, by item type and scale: 2015

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
Total	44	1	0	0	0	0	0	0	0	0	0
NOTE: Single overall scale. The vocabulary assessment includes multiple-choice items only. The item counts include vocabulary items from both the half-blocks as well as the vocabulary items embedded within the 25-minute reading comprehension blocks. "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. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2015 Reading Assessment.

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