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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 Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in NAEP Student Group Distribution Models → Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 4 Reading Combined National and State Main Assessment: 2002

NAEP Technical DocumentationProportion of variance of the group-defining contrasts accounted for by the principal components used in the population-structure model, grade 4 reading combined national and state main assessment: 2002

Type of contrast	Number of contrasts	Mean	Minimum	Maximum	Number of contrasts by proportion of variance explained
					0.00 - 0.70	0.70 - 0.80	0.80 - 0.90	0.90 - 0.95	0.95 - 1.00
SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2002 Reading Assessment.
All contrasts	1232	0.90	0.69	0.99	3	91	442	395	301
Student questionnaire	169	0.90	0.73	0.98	0	17	57	63	32
Major reporting variables	97	0.91	0.73	0.99	0	3	26	43	25
Interactions between reporting variables	241	0.90	0.69	0.99	1	17	92	83	48
Teacher questionnaire	367	0.90	0.69	0.99	1	37	105	112	112
School questionnaire	358	0.90	0.70	0.99	1	17	162	94	84

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