NAEP tdw - Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 8 Meaning Vocabulary Combined National and State Assessment: 2013

NAEP Analysis and Scaling → Estimation of Population and Student Group Distributions → Examining the Population-Structure Models Used in NAEP → Proportion of Variance Accounted For by Principal Components Used in NAEP Population-Structure Models → Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 8 Meaning Vocabulary Combined National and State Assessment: 2013

NAEP Technical DocumentationProportion of variance of the group-defining contrasts accounted for by the principal components used in the population-structure model, grade 8 meaning vocabulary combined national and state assessment: 2013
Type of contrast	Number of contrasts	Mean	Minimum	Maximum	Number of contrasts by proportion¹ of variance explained
Type of contrast	Number of contrasts	Mean	Minimum	Maximum	.00 - .70	.70 - .80	.80 - .90	.90 - .95	.95 - 1.00
† Not applicable. ¹¹ (Total Variance – Residual Variance)/Total Variance, where Total Variance consists of sampling, measurement, and other sources of error. NOTE: SD/ELL = Students with disabilities/English language learners. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2013 Reading Assessment.
Total	44	.91	.65	1	2	6	5	17	14
Student questionnaire	5	.98	.96	1	0	0	0	0	5
Major reporting variables	13	.92	.80	1	0	1	3	5	4
Interactions between reporting variables	26	.88	.65	1	2	5	2	12	5
Teacher questionnaire	†	†	†	†	†	†	†	†	†
School questionnaire	†	†	†	†	†	†	†	†	†
NIES questionnaire	†	†	†	†	†	†	†	†	†
SD/ELL questionnaire	†	†	†	†	†	†	†	†	†

Last updated 21 May 2017 (DC)