There are 'better' ways of handling gaps when calculating ADEV and siblings. Patrizia Tavela has a nice method: you pad out the time series, tagging missing points with NaNs say, and then if a difference contains a missing data point, you drop it. It works very well. I expect this is in Stable32. I think it's implemented in allantools. It's definitely implemented in the Matlab functions I wrote (tftools on GitHub).
Cheers Michael On Fri, 26 May 2017 at 12:00 am, Tom Van Baak <[email protected]> wrote: > Only Stable32 handles data gaps seamlessly. Give it a try (read the manual > for details). > > But also ask yourself how much gaps matter. Yes, they affect the accuracy > of your y-axis sigma scale and your x-axis tau scale. A few seconds every > 30 minutes is, what, a 0.1% error? That's like one pixel in a ADEV plot; > not significant. > > What I've done when I need a perfectly seamless data set is just > interpolate for rare and obviously missing phase data points. That keeps > the timescale intact. This is especially important if you plan to Fourier > transform the data: under no circumstances do you want to slip a sample in > that case. > > /tvb > > ----- Original Message ----- > From: "jimlux" <[email protected]> > To: "Discussion of precise time and frequency measurement" < > [email protected]> > Sent: Thursday, May 25, 2017 6:11 AM > Subject: [time-nuts] calculating stats with gaps in the data > > > > I'm looking at the python AllanTools package.. does it deal with gaps in > > the data series (e.g. I've got a series of phase and/or frequency > > measurements, 1 per second, but there's gaps of a few seconds every 30 > > minutes or so) > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
