Hello Ole Have you looked at dynamic Allan variance ? Patrizia Tavella wrote a few papers about this.
Cheers Michael On Wed, 16 Sep 2020 at 7:28 pm, Ole Petter Ronningen <opronnin...@gmail.com> wrote: > Hi, All > > > > I am currently working on some lather long time-series, and I find myself a > > little unsure of how to present the data. I've attached a TDEV plot below > > (that I hope makes it through) for illustration purposes, but the same > > dilemma holds for ADEV/MDEV etc. It concerns how instability is averaged > > out on long data series. > > > > The pink line below is the TDEV of the whole series and represents about 14 > > days of data. The blue lines are generated by using the "trace history" > > facility in TimeLab, each line representing roughly 12-hour "chunks" of the > > same data. > > > > It can be seen that some of the blue plots are "worse" than the pink plot - > > not only at the tail end, where it might be expected but also at short tau. > > The implications are of course that there are stretches of data where the > > TDEV is better/worse than others, but it is also clear that the TDEV plot > > of the whole data in some sense masks this. > > > > ADEV/TDEV/MDEV is what it is, and that is fine - but this is still > > information that is relevant when looking at the plot. The question at hand > > is how to convey this information in an accurate way? The error bars are > > really no help. > > > > Some kind of "min/max TDEV per tau displayed as error bars" comes to mind, > > but there are a number of issues with that approach. > > > > I am also hoping that perhaps this has been thought of before - is there > > some "standard" (or even good, or half-decent) way of calculating/showing > > this "spread of xDEV"? > > > > Thank you all, > > Ole > > > > > > [image: image.png] > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.