[ntp:questions] Re: calculating mean PPM value

Drk Ryan ryandrk at hotmail.com
Sun Sep 21 12:55:04 UTC 2003

I understand that, but to calculate the mean for, say, 2
machines...one with +50ppm frequency offset and the other with -50ppm
frequency offset.
Is the mean (50+50)/2= 50 or (50+(-50))/2 = 0

"David L. Mills" <mills at udel.edu> wrote in message news:<3F6CAC12.CE894AF8 at udel.edu>...
> Drk,
> What you see is what you get. The data represent the frequency offset as
> measured by ntpd on the machine in test. Remember, the only way to see
> these data remotely is via the ntpq program.
> Dave
> Drk Ryan wrote:
> > 
> > In Dr. Mills 1997 survey of 20,000 Internet hosts, the mean frequency
> > error was found to be 78 PPM. When calculating this value do you add
> > the |absolute| frequency errors or is it necessary to look at the +,-
> > signs involved?

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