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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 Mathematics 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 mathematics 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
		Number properties and operations	Measurement	Geometry	Data analysis and probability	Algebra
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 Mathematics State Assessment.
Alabama	233	0.68	0.72	0.68	0.67	0.68
Alaska	145	0.44	0.44	0.39	0.46	0.47
Arizona	314	0.68	0.68	0.71	0.72	0.68
Arkansas	248	0.69	0.70	0.66	0.71	0.68
California	381	0.68	0.64	0.60	0.65	0.66
Colorado	269	0.66	0.68	0.63	0.68	0.68
Connecticut	237	0.69	0.73	0.71	0.70	0.72
Delaware	208	0.63	0.65	0.67	0.65	0.62
Florida	297	0.62	0.64	0.62	0.70	0.66
Georgia	257	0.64	0.65	0.62	0.67	0.65
Hawaii	241	0.71	0.68	0.67	0.72	0.71
Idaho	269	0.65	0.67	0.64	0.68	0.65
Illinois	269	0.65	0.65	0.66	0.69	0.67
Indiana	251	0.65	0.70	0.62	0.66	0.67
Iowa	249	0.68	0.72	0.64	0.68	0.70
Kansas	273	0.66	0.63	0.61	0.65	0.64
Kentucky	241	0.61	0.65	0.61	0.60	0.63
Louisiana	234	0.67	0.70	0.68	0.68	0.68
Maine	250	0.59	0.59	0.58	0.60	0.62
Maryland	239	0.72	0.69	0.71	0.70	0.73
Massachusetts	267	0.68	0.63	0.65	0.68	0.66
Michigan	248	0.70	0.71	0.66	0.68	0.69
Minnesota	273	0.66	0.66	0.66	0.63	0.69
Mississippi	238	0.60	0.70	0.63	0.70	0.68
Missouri	247	0.66	0.66	0.69	0.66	0.68
Montana	279	0.71	0.69	0.68	0.71	0.72
Nebraska	251	0.69	0.71	0.68	0.71	0.73
Nevada	265	0.70	0.71	0.68	0.67	0.72
New Hampshire	241	0.66	0.68	0.61	0.66	0.63
New Jersey	254	0.65	0.66	0.68	0.66	0.70
New Mexico	307	0.67	0.66	0.66	0.71	0.69
New York	283	0.68	0.65	0.66	0.68	0.65
North Carolina	309	0.67	0.68	0.68	0.67	0.71
North Dakota	245	0.60	0.61	0.61	0.65	0.63
Ohio	263	0.67	0.64	0.64	0.64	0.69
Oklahoma	303	0.69	0.70	0.70	0.68	0.69
Oregon	283	0.66	0.64	0.63	0.68	0.66
Pennsylvania	250	0.68	0.66	0.68	0.72	0.69
Rhode Island	224	0.68	0.67	0.67	0.68	0.70
South Carolina	254	0.66	0.69	0.65	0.67	0.69
South Dakota	265	0.66	0.66	0.59	0.63	0.69
Tennessee	240	0.64	0.62	0.67	0.65	0.63
Texas	320	0.66	0.64	0.61	0.69	0.69
Utah	266	0.69	0.71	0.67	0.70	0.71
Vermont	225	0.65	0.67	0.64	0.65	0.65
Virginia	266	0.67	0.71	0.69	0.72	0.72
Washington	289	0.68	0.68	0.64	0.65	0.64
West Virginia	248	0.62	0.64	0.60	0.61	0.67
Wisconsin	255	0.69	0.70	0.65	0.68	0.71
Wyoming	213	0.67	0.70	0.64	0.66	0.65
Other jurisdictions
District of Columbia	170	0.67	0.72	0.73	0.71	0.72
DoDEA2	204	0.69	0.66	0.68	0.72	0.68

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