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 Science State Assessment, By Scale and Jurisdiction: 2011

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, grade 8 science state assessment, by scale and jurisdiction: 2011

Jurisdiction	Number of principal components2	Proportion1 of scale score variance accounted for by the population-structure model
		Physical science	Earth and space sciences	Life science
1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. 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), 2011 Science State Assessment.
Alabama	239	0.73	0.71	0.68
Alaska	102	0.48	0.50	0.54
Arizona	272	0.67	0.66	0.64
Arkansas	277	0.75	0.72	0.66
California	319	0.79	0.74	0.74
Colorado	255	0.70	0.69	0.65
Connecticut	256	0.72	0.69	0.68
Delaware	220	0.70	0.64	0.64
Florida	333	0.72	0.69	0.68
Georgia	288	0.73	0.72	0.69
Hawaii	241	0.71	0.63	0.60
Idaho	253	0.65	0.65	0.54
Illinois	297	0.81	0.71	0.67
Indiana	256	0.67	0.65	0.64
Iowa	256	0.66	0.62	0.58
Kansas	274	0.70	0.66	0.64
Kentucky	277	0.60	0.54	0.49
Louisiana	255	0.71	0.71	0.70
Maine	259	0.61	0.54	0.52
Maryland	276	0.70	0.67	0.60
Massachusetts	280	0.73	0.68	0.66
Michigan	267	0.71	0.65	0.62
Minnesota	270	0.73	0.64	0.61
Mississippi	239	0.75	0.71	0.66
Missouri	257	0.64	0.65	0.60
Montana	247	0.73	0.64	0.58
Nebraska	264	0.70	0.68	0.67
Nevada	288	0.75	0.66	0.67
New Hampshire	241	0.56	0.57	0.59
New Jersey	264	0.73	0.72	0.71
New Mexico	282	0.72	0.68	0.63
New York	341	0.78	0.71	0.70
North Carolina	295	0.69	0.68	0.61
North Dakota	226	0.73	0.62	0.64
Ohio	267	0.68	0.66	0.63
Oklahoma	280	0.68	0.64	0.63
Oregon	294	0.68	0.67	0.61
Pennsylvania	278	0.78	0.75	0.72
Rhode Island	229	0.77	0.71	0.70
South Carolina	279	0.68	0.68	0.64
South Dakota	253	0.62	0.57	0.57
Tennessee	257	0.70	0.69	0.64
Texas	327	0.72	0.70	0.68
Utah	277	0.67	0.64	0.61
Vermont	229	0.64	0.59	0.57
Virginia	288	0.71	0.70	0.65
Washington	305	0.71	0.63	0.66
West Virginia	240	0.56	0.59	0.51
Wisconsin	266	0.73	0.69	0.68
Wyoming	211	0.60	0.58	0.54
Other jurisdictions
District of Columbia	196	0.74	0.65	0.64
DoDEA	207	0.67	0.64	0.64

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