NAEP Technical Documentation Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Grade 4 Reading State Assessment, by Subscale and State/Jurisdiction: 2015

Proportion of scale score variance accounted for by the population-structure model, grade 4 reading state assessment, by subscale and state/jurisdiction: 2015

State/jurisdiction	Number of principal components2	Proportion of scale score variance accounted for by the conditioning model1
		Literary	Information
Alabama	234	.68	.67
Alaska	140	.59	.65
Arizona	299	.73	.73
Arkansas	238	.63	.65
California	324	.72	.74
Colorado	240	.70	.72
Connecticut	265	.65	.67
Delaware	247	.65	.68
Florida	358	.63	.59
Georgia	261	.64	.63
Hawaii	259	.67	.70
Idaho	261	.63	.69
Illinois	305	.68	.68
Indiana	252	.62	.65
Iowa	267	.67	.71
Kansas	265	.72	.73
Kentucky	239	.52	.55
Louisiana	222	.61	.64
Maine	284	.65	.67
Maryland	255	.63	.71
Massachusetts	282	.65	.71
Michigan	265	.63	.68
Minnesota	289	.75	.72
Mississippi	240	.60	.61
Missouri	263	.63	.62
Montana	266	.66	.64
Nebraska	278	.64	.70
Nevada	260	.68	.70
New Hampshire	273	.64	.66
New Jersey	249	.66	.68
New Mexico	335	.78	.96
New York	304	.67	.70
North Carolina	319	.66	.71
North Dakota	302	.62	.67
Ohio	237	.64	.67
Oklahoma	308	.67	.70
Oregon	267	.71	.71
Pennsylvania	271	.69	.74
Rhode Island	249	.67	.68
South Carolina	254	.69	.72
South Dakota	306	.69	.70
Tennessee	240	.66	.69
Texas	311	.70	.70
Utah	160	.50	.48
Vermont	238	.61	.67
Virginia	250	.65	.72
Washington	263	.69	.70
West Virginia	239	.59	.65
Wisconsin	274	.64	.67
Wyoming	274	.60	.64
Other jurisdictions
District of Columbia	187	.69	.73
DoDEA	217	.62	.56
1 (Total Variance – Residual Variance) / Total Variance, where Total Variance consists of sampling, measurement, and other sources of error. 2 Excluding the constant term. 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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