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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Scales → Correlations Among NAEP Subject Area Subscales → Conditional Correlations and Variances of the Subscales, by Grade, Science Combined National and State Main Assessment: 2005

NAEP Technical DocumentationConditional correlations and variances of the subscales, by grade, science combined national and state main assessment: 2005

Grade	Scale	Physical science	Earth science	Life science
4	Physical  science	§	§	§
	Earth science	0.84	§	§
	Life science	0.80	0.87	§
	Residual variance	0.50	0.42	0.41
8	Physical  science	§	§	§
	Earth science	0.86	§	§
	Life science	0.88	0.87	§
	Residual variance	0.44	0.49	0.42
12	Physical science	§	§	§
	Earth science	0.86	§	§
	Life science	0.86	0.83	§
	Residual variance	0.33	0.33	0.34
§ These cells do not display data because this is a correlation matrix. Information is shown for the lower triangle only to eliminate redundant information. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2005 Science Assessment.

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