[time-nuts] Changing ADEV, (was Phase, One edge or two?)

Magnus Danielson magnus at rubidium.dyndns.org
Sat Oct 25 14:18:21 EDT 2014



On 10/25/2014 07:06 PM, Tom Van Baak wrote:
>> In the case of the TimePod, the data can be presented when you have *very* few samples to work with.
>> That said, it is interesting to watch it bring up error bars (which are indeed correctly calculated)
>> and then see the trace walk outside those error bars as the run progresses.
>> There are other measurements that are a bit less susceptible to this.
>> None of them have any magic to get around sqrt(N).
>>
>> Bob
>
> Maybe I don't understand error bars. For a dynamic display like TimeLab, walking outside (1 sigma) error bars is expected about 1/3 of the time, no?

Error bars works a little differently, as they indicate with some 
probability (say 1-sigma) within which range the real value is.

By the way, sqrt(N) is not very accurate estimator.

Cheers,
Magnus



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