Some of the confusion might come from different measurement systems dealing with different data, either phase (in seconds), or frequency (fractional).
Sub-sampling works for phase-data, just throw away the in-between samples and look at phase samples that are tau-distance apart. Decimation works for frequency-data, if you collect with 1s gate-time and want to look at tau=10s, then bin together 10 samples and create a new time-series that is 10-fold shorter, and compute adev from that. FWIW IIRC all the allantools examples/tests that (successfully) compare results against Stable32, using frequency input data, just use simple non-overlapping 'boxcar' decimation - nothing more fancy or elaborate. AW On Tue, Feb 25, 2020 at 7:10 PM Dana Whitlow via time-nuts < time-nuts@lists.febo.com> wrote: > Let's see if I have this correct, then: > > "Decimation" refers to the two-step procedure (filtering followed by > picking every nth sample), and > "Sub-sampling" (or "downsampling") properly refers to taking every nth > sample and discarding the rest. > > Is this correct? > > And thanks for all the responses. > > Dana > > > On Tue, Feb 25, 2020 at 10:09 AM George Watson via time-nuts < > time-nuts@lists.febo.com> wrote: > > > > > _______________________________________________ > > 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. > _______________________________________________ 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.