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NAEP Analysis and Scaling → Estimation of Population and Student Group Distributions → Examining the Population-Structure Models Used in NAEP → Proportion of Scale Score Variance Accounted for by the Population-Structure Models → Proportion of Scale Score Variance Accounted for by the Population-Structure Models, Grade 8 Reading Combined National and State Main Assessment, by Subscale and Jurisdiction: 2005

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure models, grade 8 reading combined national and state main assessment, by subscale and jurisdiction: 2005

Jurisdiction	Number of principal components2	Proportion1 of scale score variance accounted for by the population-structure model
		Literary	Information	Task
Alabama	223	0.65	0.67	0.71
Alaska	105	0.34	0.43	0.48
Arizona	264	0.57	0.61	0.67
Arkansas	244	0.61	0.65	0.64
California	365	0.50	0.56	0.57
Colorado	244	0.61	0.63	0.66
Connecticut	237	0.59	0.66	0.73
Delaware	186	0.56	0.53	0.60
Florida	289	0.55	0.57	0.58
Georgia	261	0.59	0.60	0.62
Hawaii	218	0.58	0.59	0.65
Idaho	236	0.48	0.56	0.60
Illinois	267	0.57	0.64	0.70
Indiana	241	0.59	0.58	0.66
Iowa	236	0.60	0.59	0.60
Kansas	247	0.53	0.62	0.65
Kentucky	240	0.52	0.56	0.61
Louisiana	226	0.63	0.66	0.69
Maine	231	0.57	0.60	0.63
Maryland	239	0.64	0.62	0.68
Massachusetts	255	0.58	0.65	0.68
Michigan	232	0.58	0.61	0.69
Minnesota	238	0.62	0.64	0.71
Mississippi	231	0.58	0.61	0.70
Missouri	239	0.65	0.60	0.60
Montana	237	0.54	0.60	0.62
Nebraska	241	0.63	0.61	0.69
Nevada	247	0.56	0.63	0.64
New Hampshire	222	0.63	0.59	0.61
New Jersey	247	0.60	0.64	0.67
New Mexico	256	0.60	0.68	0.70
New York	284	0.61	0.64	0.63
North Carolina	265	0.59	0.62	0.65
North Dakota	215	0.54	0.54	0.62
Ohio	241	0.59	0.58	0.65
Oklahoma	255	0.59	0.61	0.67
Oregon	256	0.61	0.65	0.70
Pennsylvania	235	0.67	0.67	0.70
Rhode Island	216	0.60	0.63	0.66
South Carolina	240	0.55	0.56	0.59
South Dakota	229	0.51	0.61	0.64
Tennessee	227	0.56	0.61	0.66
Texas	307	0.51	0.53	0.57
Utah	244	0.59	0.62	0.62
Vermont	216	0.60	0.62	0.59
Virginia	251	0.60	0.62	0.65
Washington	267	0.64	0.58	0.67
West Virginia	227	0.56	0.60	0.63
Wisconsin	236	0.60	0.62	0.64
Wyoming	199	0.58	0.62	0.66
Other jurisdictions
District of Columbia	169	0.63	0.64	0.63
DoDEA3	200	0.56	0.62	0.66
1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. 2Excluding the constant term. 3 Department of Defense Education Activity. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005 Reading Assessment.

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