[ntp:questions] [Thumbgps-devel] good paper on timing and delay

David Woolley david at ex.djwhome.demon.invalid
Wed May 23 20:50:44 UTC 2012

Brian Utterback wrote:

> I wish I knew more about Statistics. Clearly the behavior of individual 
> poll data over time tells you something about the drift rate. And 

You have missed some important factors, namely the statistics of the 
noise both phase, mainly from polling, and frequency, mainly from 
temperature, and how they vary with time.

If the only error was phase with a gaussian distribution, the problem 
would be simple.

> adjusting for drift over time means that they also tell you something 
> about the offset. And just as clearly for any set of poll data, the 
> smaller the delay the less the maximum offset error. I wonder if this is 
> a solved problem in Stats? There must be an optimum solution to making 
> this calculation, one that does not blindly throw away a lot of data 
> just because it isn't the best data of the set, nor ignore the fact that 
> some of the data has a better error tolerance than the rest.

More information about the questions mailing list