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 8 Science State Assessment, By Scale and Jurisdiction: 2009

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, grade 8 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	243	0.72	0.67	0.68
Arizona	290	0.72	0.67	0.69
Arkansas	270	0.72	0.68	0.66
California	353	0.77	0.72	0.74
Colorado	279	0.69	0.61	0.65
Connecticut	262	0.71	0.66	0.69
Delaware	216	0.66	0.61	0.62
Florida	341	0.62	0.66	0.61
Georgia	300	0.71	0.70	0.67
Hawaii	235	0.71	0.66	0.59
Idaho	272	0.65	0.62	0.60
Illinois	292	0.72	0.66	0.68
Indiana	263	0.71	0.66	0.63
Iowa	258	0.64	0.59	0.61
Kentucky	265	0.53	0.52	0.48
Louisiana	252	0.73	0.71	0.66
Maine	253	0.55	0.51	0.51
Maryland	268	0.72	0.71	0.64
Massachusetts	285	0.72	0.66	0.64
Michigan	267	0.68	0.65	0.65
Minnesota	271	0.69	0.61	0.59
Mississippi	242	0.69	0.68	0.63
Missouri	261	0.68	0.62	0.62
Montana	244	0.59	0.58	0.54
Nevada	280	0.69	0.64	0.64
New Hampshire	241	0.61	0.55	0.54
New Jersey	273	0.69	0.61	0.65
New Mexico	259	0.72	0.67	0.67
New York	324	0.75	0.71	0.67
Nortd Carolina	309	0.67	0.65	0.64
Nortd Dakota	230	0.65	0.55	0.57
Ohio	267	0.69	0.62	0.61
Oklahoma	268	0.63	0.59	0.61
Oregon	283	0.66	0.58	0.58
Pennsylvania	283	0.72	0.67	0.68
Rhode Island	233	0.69	0.67	0.63
South Carolina	276	0.74	0.71	0.64
South Dakota	246	0.62	0.55	0.61
Tennessee	254	0.67	0.68	0.62
Texas	313	0.69	0.62	0.62
Utah	272	0.67	0.64	0.62
Virginia	301	0.66	0.65	0.61
Washington	285	0.63	0.58	0.61
West Virginia	245	0.57	0.55	0.52
Wisconsin	278	0.69	0.60	0.62
Wyoming	202	0.67	0.59	0.62
Other jurisdictions
DoDEA3	202	0.63	0.60	0.59

Proportion of scale score variance accounted for by the population-structure model, grade 8 science state assessment, by scale and jurisdiction: 2009

Jurisdiction	Number of principal components2	Proportion1 of scale score variance accounted for by the conditioning model
		OneScale4
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. 4 Univariate scale. 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	243	0.65
Arizona	290	0.66
Arkansas	270	0.67
California	353	0.71
Colorado	279	0.61
Connecticut	262	0.67
Delaware	216	0.62
Florida	341	0.60
Georgia	300	0.66
Hawaii	235	0.62
Idaho	272	0.61
Illinois	292	0.65
Indiana	263	0.65
Iowa	258	0.60
Kentucky	265	0.50
Louisiana	252	0.67
Maine	253	0.50
Maryland	268	0.66
Massachusetts	285	0.67
Michigan	267	0.63
Minnesota	271	0.61
Mississippi	242	0.62
Missouri	261	0.61
Montana	244	0.54
Nevada	280	0.63
New Hampshire	241	0.53
New Jersey	273	0.64
New Mexico	259	0.64
New York	324	0.68
North Carolina	309	0.63
North Dakota	230	0.53
Ohio	267	0.62
Oklahoma	268	0.58
Oregon	283	0.57
Pennsylvania	283	0.65
Rhode Island	233	0.64
South Carolina	276	0.68
South Dakota	246	0.57
Tennessee	254	0.65
Texas	313	0.61
Utah	272	0.62
Virginia	301	0.60
Washington	285	0.59
West Virginia	245	0.53
Wisconsin	278	0.61
Wyoming	202	0.60
Other jurisdictions
DoDEA3	216	0.62

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