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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 Model → Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Grade 8 Reading Combined National and State Main Assessment, By Scale and Jurisdiction: 2007

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, grade 8 reading combined national and state main assessment, by scale and jurisdiction: 2007

Jurisdiction	Number of principal components	Proportion1 of scale score variance accounted for by the population-structure model
		Literary	Information	Task
1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. 2 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), 2007 Reading National and State Assessments.
Alabama	243	0.60	0.66	0.65
Alaska	151	0.46	0.51	0.61
Arizona	331	0.63	0.65	0.72
Arkansas	258	0.64	0.68	0.80
California	410	0.57	0.65	0.68
Colorado	279	0.63	0.68	0.75
Connecticut	254	0.60	0.71	0.76
Delaware	209	0.54	0.55	0.72
Florida	315	0.55	0.56	0.68
Georgia	269	0.58	0.60	0.73
Hawaii	249	0.60	0.69	0.76
Idaho	274	0.62	0.63	0.73
Illinois	285	0.62	0.63	0.70
Indiana	266	0.56	0.60	0.72
Iowa	267	0.56	0.66	0.69
Kansas	280	0.60	0.68	0.76
Kentucky	243	0.60	0.68	0.76
Louisiana	250	0.55	0.61	0.73
Maine	260	0.55	0.63	0.71
Maryland	252	0.60	0.63	0.72
Massachusetts	282	0.65	0.66	0.77
Michigan	256	0.62	0.63	0.77
Minnesota	277	0.64	0.65	0.74
Mississippi	249	0.58	0.61	0.70
Missouri	266	0.55	0.64	0.75
Montana	292	0.67	0.72	0.83
Nebraska	255	0.54	0.65	0.70
Nevada	275	0.65	0.64	0.78
New Hampshire	245	0.56	0.60	0.71
New Jersey	262	0.56	0.69	0.78
New Mexico	318	0.61	0.73	0.77
New York	292	0.61	0.66	0.73
North Carolina	324	0.60	0.68	0.72
North Dakota	245	0.53	0.63	0.74
Ohio	270	0.60	0.64	0.71
Oklahoma	322	0.62	0.68	0.78
Oregon	293	0.63	0.65	0.79
Pennsylvania	266	0.59	0.65	0.73
Rhode Island	240	0.58	0.64	0.71
South Carolina	260	0.62	0.62	0.75
South Dakota	266	0.57	0.66	0.68
Tennessee	253	0.57	0.61	0.69
Texas	331	0.57	0.61	0.69
Utah	266	0.61	0.62	0.71
Vermont	227	0.57	0.64	0.72
Virginia	275	0.58	0.64	0.69
Washington	309	0.57	0.68	0.78
West Virginia	257	0.57	0.66	0.72
Wisconsin	269	0.63	0.68	0.78
Wyoming	218	0.58	0.69	0.78
Other jurisdictions
District of Columbia	169	0.59	0.65	0.73
DoDEA2	196	0.58	0.66	0.76

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