NAEP Analysis and Scaling - Proportion of Scale Score Variance Accounted for by the Population-Structure Model, Grade 8 Writing Combined National and State Main Assessment, by Jurisdiction: 2007

NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure model, grade 8 writing combined national and state main assessment, by jurisdiction: 2007
Jurisdiction	Number of principal components	Proportion¹ of scale score variance accounted for by the population-structure model
¹ (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance. ² Department of Defense Education Activity. NOTE: The writing assessment had a single overall scale SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2007 Writing National and State Assessments.
Alabama	224	0.65
Arizona	317	0.71
Arkansas	241	0.68
California	390	0.66
Colorado	264	0.71
Connecticut	234	0.68
Delaware	187	0.55
Florida	304	0.62
Georgia	253	0.66
Hawaii	230	0.67
Idaho	255	0.60
Illinois	265	0.69
Indiana	243	0.71
Iowa	245	0.67
Kansas	265	0.68
Kentucky	221	0.60
Louisiana	232	0.71
Maine	243	0.61
Massachusetts	263	0.71
Michigan	234	0.68
Minnesota	266	0.67
Mississippi	226	0.65
Missouri	243	0.71
Montana	268	0.69
Nevada	252	0.67
New Hampshire	228	0.68
New Jersey	242	0.67
New Mexico	306	0.70
New York	275	0.68
North Carolina	304	0.69
North Dakota	230	0.62
Ohio	256	0.70
Oklahoma	306	0.70
Pennsylvania	246	0.68
Rhode Island	220	0.70
South Carolina	250	0.68
Tennessee	234	0.64
Texas	306	0.62
Utah	253	0.65
Vermont	208	0.64
Virginia	260	0.67
Washington	286	0.65
West Virginia	233	0.69
Wisconsin	248	0.69
Wyoming	194	0.71
Other jurisdictions
DoDEA²	177	0.62

Last updated 24 June 2010 (GF)