[time-nuts] ADEV vs. OADEV
bruce.griffiths at xtra.co.nz
Thu Jan 22 19:10:06 EST 2009
Tom Van Baak wrote:
>> One point of confusion is that AVAR(tau) should not be directly
>> interpreted as Allan Variance in general, it is actually already defined
>> and reserved to mean a chosen Allan Variance estimator. This is an
> Sorry if I'm jumping into this thread late, but this statement
> confuses me. Since when is "AVAR" not simply short-hand
> for "Allan Variance"?
> Next you'll tell me SDEV isn't Standard Deviation because some
> self-important standards organization decided otherwise.
Perhaps the real confusion is between the actual definition of the Allan
variance etc, and the various estimators of the Allan variance etc.
The so called classical Allan variance is nothing more than an estimator
of the Allan variance.
The so called overlapped Allan variance is a better (more accurate)
estimator of the Allan variance.
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