Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 8 Geography National Assessment: 2014

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 Geography National Assessment: 2014

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Proportion of Variance of the Group-Defining Contrasts Accounted for by the Principal Components Used in the Population-Structure Model, Grade 8 Geography National Assessment: 2014
Proportion of variance of the group-defining contrasts accounted for by the principal components used in the population-structure model, grade 8 geography national assessment: 2014
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
¹(Total Variance – Residual Variance) / Total Variance, where Total Variance consists of sampling, measurement, and other sources of error. NOTE: SD/EL = Students with disabilities/English learners. In 2014, grades 4 and 12 were not assessed. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2014 Geography Assessment.
Total	1243	.90	.64	.99	10	53	500	494	186
Student questionnaire	229	.89	.66	.98	6	17	62	82	36
Major reporting variables	74	.91	.77	.99	0	1	32	23	19
Interactions between reporting variables	244	.89	.64	.98	8	19	82	110	28
Teacher questionnaire	377	.90	.82	.99	0	0	208	110	60
School questionnaire	282	.92	.84	.99	0	0	91	149	42
SD/EL questionnaire	33	.87	.78	.94	0	7	14	10	3
Student questionnaire indices	4	.90	.87	.94	0	0	2	2	0

Last updated 30 August 2021 (ML)