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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 Science State Assessment (Accommodations Permitted [R3]): 2000
NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure models, grade 8 science state assessment (accommodations permitted [R3]): 2000
Jurisdiction Number of
principal components2		 Proportion1 of scale score variance
Physical science Earth science Life science
Alabama 219 0.75 0.72 0.69
Arizona 208 0.73 0.77 0.74
Arkansas 220 0.72 0.72 0.74
California 214 0.76 0.77 0.76
Connecticut 225 0.72 0.74 0.72
Georgia 240 0.76 0.70 0.72
Hawaii 201 0.70 0.70 0.64
Idaho 198 0.72 0.70 0.70
Illinois 205 0.76 0.79 0.77
Indiana 198 0.74 0.76 0.72
Kentucky 221 0.68 0.62 0.67
Louisiana 226 0.81 0.78 0.74
Maine 215 0.63 0.61 0.67
Maryland 229 0.78 0.74 0.72
Massachusetts 227 0.73 0.69 0.72
Michigan 207 0.72 0.73 0.73
Minnesota 190 0.69 0.68 0.72
Mississippi 220 0.71 0.67 0.67
Missouri 224 0.72 0.68 0.71
Montana 183 0.73 0.70 0.71
Nebraska 198 0.72 0.70 0.74
Nevada 218 0.73 0.67 0.68
New Mexico 224 0.80 0.71 0.74
New York 205 0.81 0.82 0.83
North Carolina 236 0.73 0.74 0.69
North Dakota 199 0.65 0.64 0.65
Ohio 205 0.72 0.68 0.69
Oklahoma 223 0.69 0.63 0.62
Oregon 215 0.77 0.71 0.74
Rhode Island 204 0.71 0.71 0.69
South Carolina 220 0.75 0.74 0.72
Tennessee 220 0.70 0.71 0.73
Texas 232 0.74 0.73 0.73
Utah 227 0.70 0.67 0.66
Vermont 193 0.70 0.69 0.70
Virginia 237 0.72 0.68 0.68
West Virginia 227 0.68 0.68 0.72
Wyoming 199 0.60 0.58 0.64
Other jurisdictions
American Samoa 124 0.88 0.90 0.88
DDESS3 142 0.78 0.77 0.82
DoDDS4 178 0.61 0.63 0.59
Guam 147 0.70 0.69 0.68
1 Proportion is (Total Variance - Residual Variance)/Total Variance.
2 Excluding the constant term.
3 Department of Defense Domestic Dependent Elementary and Secondary Schools.
4 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), 2000 Science Assessment.
Last updated 31 March 2008 (GF)

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