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 Model, Grade 4 Science State Assessment, By Scale and Jurisdiction: 2009

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, grade 4 science state assessment, by scale and jurisdiction: 2009

Jurisdiction	Number of principal components2	Proportion1 of scale score variance accounted for by the population-structure model
		Physical science	Earth and space science	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. 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), 2009 Science State Assessment.
Alabama	287	0.74	0.73	0.69
Arizona	336	0.75	0.74	0.74
Arkansas	312	0.73	0.72	0.68
California	405	0.81	0.79	0.76
Colorado	307	0.71	0.74	0.68
Connecticut	313	0.76	0.75	0.70
Delaware	281	0.70	0.67	0.67
Florida	412	0.69	0.69	0.65
Georgia	334	0.71	0.74	0.68
Hawaii	305	0.73	0.74	0.71
Idaho	323	0.66	0.68	0.63
Illinois	374	0.74	0.76	0.69
Indiana	306	0.69	0.71	0.66
Iowa	296	0.66	0.69	0.65
Kentucky	306	0.65	0.59	0.58
Louisiana	295	0.75	0.71	0.68
Maine	320	0.61	0.65	0.58
Maryland	303	0.70	0.68	0.65
Massachusetts	342	0.70	0.75	0.68
Michigan	314	0.71	0.73	0.69
Minnesota	329	0.69	0.69	0.64
Mississippi	307	0.74	0.70	0.66
Missouri	302	0.69	0.72	0.64
Montana	311	0.66	0.62	0.63
Nevada	326	0.67	0.72	0.67
New Hampshire	325	0.65	0.62	0.58
New Jersey	320	0.72	0.71	0.67
New Mexico	350	0.73	0.74	0.69
New York	391	0.69	0.69	0.61
North Carolina	394	0.71	0.73	0.67
North Dakota	276	0.60	0.69	0.61
Ohio	284	0.69	0.71	0.65
Oklahoma	320	0.65	0.69	0.61
Oregon	322	0.62	0.64	0.59
Pennsylvania	327	0.74	0.74	0.69
Rhode Island	292	0.73	0.77	0.68
South Carolina	324	0.74	0.73	0.67
South Dakota	300	0.64	0.64	0.62
Tennessee	310	0.68	0.74	0.68
Texas	386	0.72	0.75	0.72
Utah	322	0.69	0.67	0.64
Virginia	302	0.68	0.65	0.67
Washington	324	0.75	0.72	0.71
West Virginia	296	0.64	0.62	0.58
Wisconsin	348	0.69	0.70	0.66
Wyoming	264	0.62	0.63	0.57
Other jurisdictions
DoDEA3	267	0.70	0.70	0.62

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