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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 4 Science Combined National and State Main Assessment, by Subscale and Jurisdiction: 2005
NAEP Technical DocumentationProportion of scale score variance accounted for by the population-structure models, grade 4 science combined national and state main assessment, by subscale and jurisdiction: 2005
Jurisdiction Number of principal components2 Proportion1 of scale score variance accounted for by the population-structure model
Physical Earth Life
Alabama 250 0.68 0.69 0.65
Arizona 273 0.66 0.68 0.66
Arkansas 254 0.65 0.66 0.70
California 399 0.58 0.61 0.59
Colorado 252 0.63 0.60 0.59
Connecticut 268 0.65 0.66 0.61
Delaware 234 0.63 0.60 0.58
Florida 325 0.60 0.59 0.57
Georgia 280 0.63 0.60 0.61
Hawaii 253 0.59 0.60 0.60
Idaho 260 0.58 0.55 0.55
Illinois 296 0.68 0.68 0.63
Indiana 255 0.61 0.57 0.59
Kentucky 242 0.50 0.55 0.49
Louisiana 251 0.65 0.63 0.69
Maine 275 0.54 0.53 0.53
Maryland 233 0.66 0.63 0.59
Massachusetts 292 0.65 0.64 0.64
Michigan 234 0.65 0.65 0.67
Minnesota 249 0.63 0.60 0.58
Mississippi 268 0.69 0.67 0.65
Missouri 260 0.56 0.56 0.54
Montana 272 0.60 0.56 0.57
Nevada 278 0.58 0.60 0.58
New Hampshire 276 0.58 0.57 0.50
New Jersey 268 0.63 0.63 0.59
New Mexico 292 0.64 0.65 0.64
North Carolina 299 0.59 0.64 0.60
North Dakota 251 0.54 0.56 0.56
Ohio 264 0.59 0.68 0.60
Oklahoma 270 0.60 0.62 0.66
Oregon 267 0.55 0.53 0.60
Rhode Island 256 0.61 0.64 0.65
South Carolina 253 0.62 0.60 0.61
South Dakota 263 0.59 0.61 0.60
Tennessee 265 0.59 0.61 0.60
Texas 357 0.60 0.60 0.56
Utah 247 0.57 0.59 0.57
Vermont 248 0.58 0.55 0.53
Virginia 257 0.61 0.65 0.63
Washington 265 0.57 0.60 0.56
West Virginia 251 0.51 0.60 0.56
Wisconsin 247 0.56 0.58 0.60
Wyoming 216 0.58 0.64 0.58
Other jurisdictions
DoDEA3 251 0.51 0.57 0.56
1 (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of both sampling and measurement error variance.
2Excluding 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), 2005 Science Assessment.
Last updated 14 May 2009 (RF)

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