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st: covariance structure name?


From   David Airey <david.airey@vanderbilt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: covariance structure name?
Date   Fri, 18 Aug 2006 13:23:00 -0500

What kind of covariance structure is the following, that is, does it have name? Obviously, the correlations drop off for time points more separated (b1_b2 vs b1_b6), but also, the correlation changes over time (b1_b2 vs b5_b6). These correlations are of a behavioral measure every minute for 6 minutes in a couple hundred mice.

| b1 b2 b3 b4 b5 b6
-------------+------------------------------------------------------
b1 | 1.0000
b2 | 0.8297 1.0000
b3 | 0.7096 0.7708 1.0000
b4 | 0.5865 0.5950 0.7378 1.0000
b5 | 0.5103 0.5177 0.6201 0.7111 1.0000
b6 | 0.4095 0.4479 0.5271 0.5489 0.6815 1.0000

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