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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 8 Reading Combined National and State Assessment, by Jurisdiction: 2002

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, by jurisdiction, grade 8 reading combined national and state assessment: 2002

Jurisdiction	Number of principal components	Proportion1 of scale score variance
		Reading for literary experience	Reading to gain information	Reading to perform a task
Alabama	238	0.63	0.62	0.71
Arizona	266	0.66	0.64	0.68
Arkansas	239	0.63	0.62	0.75
California	257	0.67	0.72	0.74
Connecticut	263	0.64	0.64	0.70
Delaware	213	0.54	0.49	0.62
Florida	280	0.58	0.61	0.66
Georgia	272	0.64	0.62	0.68
Hawaii	236	0.60	0.65	0.66
Idaho	223	0.59	0.57	0.70
Indiana	225	0.60	0.61	0.64
Kansas	218	0.69	0.69	0.71
Kentucky	239	0.55	0.59	0.62
Louisiana	243	0.64	0.61	0.76
Maine	234	0.61	0.59	0.66
Maryland	247	0.65	0.62	0.69
Massachusetts	259	0.70	0.69	0.78
Michigan	241	0.60	0.54	0.68
Mississippi	230	0.60	0.59	0.69
Missouri	242	0.62	0.53	0.66
Montana	198	0.62	0.61	0.73
Nebraska	209	0.57	0.61	0.57
Nevada	235	0.57	0.55	0.68
New Mexico	257	0.67	0.64	0.72
New York	221	0.64	0.69	0.76
North Carolina	267	0.65	0.61	0.69
North Dakota	200	0.70	0.64	0.71
Ohio	239	0.63	0.61	0.69
Oklahoma	266	0.64	0.66	0.74
Oregon	235	0.69	0.67	0.66
Pennsylvania	265	0.65	0.64	0.77
Rhode Island	218	0.62	0.61	0.71
South Carolina	269	0.68	0.62	0.70
Tennessee	224	0.68	0.63	0.76
Texas	288	0.73	0.67	0.74
Utah	269	0.69	0.63	0.70
Vermont	214	0.55	0.54	0.67
Virginia	286	0.68	0.63	0.68
Washington	234	0.65	0.61	0.70
West Virginia	236	0.63	0.57	0.64
Wyoming	205	0.56	0.50	0.63
Other jurisdictions
American Samoa	136	1.00	0.90	0.99
District of Columbia	183	0.67	0.65	0.60
DDESS2	154	0.90	0.80	0.93
DoDDS3	182	0.61	0.56	0.60
Guam	159	0.72	0.70	0.77
Virgin Islands	135	0.92	0.92	0.90
1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. 2 Department of Defense Domestic Dependent Elementary and Secondary Schools. 3 Department of Defense Dependents Schools (Overseas). SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Reading Assessment.

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