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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 4 Science 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 4 science 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
		Physical	Earth	Life
Alabama	250	0.68	0.69	0.65
Arizona	273	0.66	0.68	0.66
Arkansas	254	0.65	0.66	0.70
California	399	0.58	0.61	0.59
Colorado	252	0.63	0.60	0.59
Connecticut	268	0.65	0.66	0.61
Delaware	234	0.63	0.60	0.58
Florida	325	0.60	0.59	0.57
Georgia	280	0.63	0.60	0.61
Hawaii	253	0.59	0.60	0.60
Idaho	260	0.58	0.55	0.55
Illinois	296	0.68	0.68	0.63
Indiana	255	0.61	0.57	0.59
Kentucky	242	0.50	0.55	0.49
Louisiana	251	0.65	0.63	0.69
Maine	275	0.54	0.53	0.53
Maryland	233	0.66	0.63	0.59
Massachusetts	292	0.65	0.64	0.64
Michigan	234	0.65	0.65	0.67
Minnesota	249	0.63	0.60	0.58
Mississippi	268	0.69	0.67	0.65
Missouri	260	0.56	0.56	0.54
Montana	272	0.60	0.56	0.57
Nevada	278	0.58	0.60	0.58
New Hampshire	276	0.58	0.57	0.50
New Jersey	268	0.63	0.63	0.59
New Mexico	292	0.64	0.65	0.64
North Carolina	299	0.59	0.64	0.60
North Dakota	251	0.54	0.56	0.56
Ohio	264	0.59	0.68	0.60
Oklahoma	270	0.60	0.62	0.66
Oregon	267	0.55	0.53	0.60
Rhode Island	256	0.61	0.64	0.65
South Carolina	253	0.62	0.60	0.61
South Dakota	263	0.59	0.61	0.60
Tennessee	265	0.59	0.61	0.60
Texas	357	0.60	0.60	0.56
Utah	247	0.57	0.59	0.57
Vermont	248	0.58	0.55	0.53
Virginia	257	0.61	0.65	0.63
Washington	265	0.57	0.60	0.56
West Virginia	251	0.51	0.60	0.56
Wisconsin	247	0.56	0.58	0.60
Wyoming	216	0.58	0.64	0.58
Other jurisdictions
DoDEA3	251	0.51	0.57	0.56
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 Science Assessment.

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