23e-CovarianceStructure

23e-CovarianceStructure - EXST7015 : Statistical Techniques...

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EXST7015 : Statistical Techniques II Geaghan Split-plot and Repeated measures designs SAS example Page 1 23e-CovarianceStructure Some of the covariance structures available in SAS proc mixed. From SAS Institute Inc., SAS/STAT software changes and enhancements through release 6.11 . Cary, NC, 1996. Type Option ij th element Structure No structure no repeated statement or split plot σ 2 for i=j, 0 otherwise σ 2 [I] = σ 2 2 2 2 000 00 0 0 L N M M M M O Q P P P P Variance components VC σ i 2 for i=j, 0 otherwise 1 2 2 2 3 2 4 2 0 0 L N M M M M O Q P P P P Compound Symmetry CS σ 2 + σ 1 2 for i=j, σ 1 2 otherwise two levels of σ 2 σσ σσσ 2 1 2 1 2 1 2 1 2 1 22 1 2 1 2 1 2 1 2 1 1 2 1 2 1 2 1 2 1 1 2 + + + + L N M M M M O Q P P P P Unstructured UN σ i 2 for i=j, symmetric covariance σ ij = σ ji σσσσ 11 2 21 31 41 21 22 2 32 42 31 32 33 2 43 41 42 43 44 2 L N M M M M O Q P P P P First-Order Autoregressive
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This note was uploaded on 12/29/2011 for the course EXST 7087 taught by Professor Wang,j during the Fall '08 term at LSU.

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