[time-nuts] ADEV vs. OADEV

Bruce Griffiths 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.
>
> /tvb
>
>
>   
Tom

Perhaps the real confusion is between the actual definition of the Allan
variance etc, and the various estimators of the Allan variance etc.

For example:
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.

Bruce




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