Yo Achim! On Tue, 07 Feb 2017 20:56:36 +0100 Achim Gratz <strom...@nexgo.de> wrote:
> Hal Murray writes:
> > Looks like we are getting into the old precision vs accuracy tangle.
> > Do we have a glossary with useful descriptions?
> > That slot should represent the number of useful bits.
>
> It really doesn't help that precision, accuracy and resolution have a
> number of different meanings depending on the context. It is doubly
> unfortunate that NTP necessarily uses several of these contexts.
+1
> In measurement statistics, precision describes the variability of the
> distribution of many repeated measurements of the same quantity and
> accuracy the deviation of the location parameter on that statistic to
> the "ground truth" (or more commonly to another measurement that ius
> known to have higher precision and accuracy). It is generally assumed
> that the measurement process has much higher resolution than the
> precision of the measurement and the measurement distribution can be
> assumed to be continous. Resolution in this context is the smallest
> change in the measured quantity that will yield a discernible change
> of the measured value.
I think you are assuming way too much. For example, on the RasPi the
resolution is worse than the accurcay of the GPS.
RGDS
GARY
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