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

Bob Camp kb8tq at n1k.org
Sat Oct 25 14:11:51 EDT 2014


If you plot the data versus the six sigma bars (should have been more precise), you will see it walk outside them as well.


> On Oct 25, 2014, at 1:06 PM, Tom Van Baak <tvb at LeapSecond.com> 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?
> /tvb
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