[time-nuts] ADEV vs. OADEV

Magnus Danielson magnus at rubidium.dyndns.org
Thu Jan 22 21:28:19 EST 2009


Bruce,

Bruce Griffiths skrev:
> Addendum:
> 
> There would appear to be only 3 underlying frequency stability
> statistics of interest in this paper:
> 
> 1) Allan variance
> 
> 2) Modified Allan variance
> 
> 3) Hadamard variance
> 
> Each of which has a different phase transfer function.
> 
> All other statistical quantities related to frequency stability in this
> paper are actually estimators of one of the above underlying statistics
> Each estimator has different confidence limits and a different bias
> function which may depend on phase noise type.
> Correction for the underlying bias of each estimator is desirable before
> plotting the results.
> Confidence limits are also useful.

I agree... very good points.

Cheers,
Magnus




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