Please note that this is a stats question and not a Stata question;
which is the purpose of the list. If you have a stats question try
MedStats.
It would seem you have a autoregressive structure. The autoregressive
correlation model formalizes the idea that the magnitude of
correlation among observations "decays" or "drop off" as they become
farther apart.
Raphael
On 8/18/06, David Airey <[email protected]> wrote:
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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