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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 8 Reading Combined National and State Main Assessment: 2003

NAEP Technical DocumentationProportion of variance of the group-defining contrasts accounted for by the principal components used in the population-structure model, grade 8 reading combined national and state main assessment: 2003

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), 2003 Reading Assessment.
All contrasts	1460	0.90	0.62	0.99	11	97	469	563	320
Student questionnaire	213	0.88	0.62	0.99	2	25	80	73	33
Major reporting variables	100	0.92	0.72	0.99	0	4	22	35	39
Interactions between reporting variables	798	0.91	0.63	0.98	1	30	208	361	198
Teacher questionnaire	104	0.87	0.63	0.98	7	10	36	27	24
School questionnaire	245	0.87	0.68	0.98	1	28	123	67	26

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