| Re: 回复: [chrony-users] question about the values in critical_runs array |
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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: 回复: [chrony-users] question about the values in critical_runs array
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Thu, 18 Jul 2024 15:04:09 +0200
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On Tue, Jul 09, 2024 at 11:34:04AM +0000, 邹林志08963 wrote:
> I found a formula on the web:
>
> Z = [ r - E(r) ] / sigma
>
> E(r) = ( 2 * n1 * n2 ) / ( n1 + n2 ) + 1,
>
> sigma = sqrt{ [ 2 * n1 * n2 * ( 2 * n1 * n2 - n1 - n2 ) ] / [ ( n1 + n2 ) * ( n1 + n2 ) * ( n1 + n2 -1 ) ] }
>
> if Z is z , r is runs , E(r) is mu , sigma is sqrt(var), then r = Z * sigma + E(r).
>
> should runs be "mu + sqrt(var)" or "mu -sqrt(var)" ?
I'm not sure what exactly you are pointing out here, but in our case
we care only about the lower bound to increase the number of runs when
it's lower than expected for the number of samples. If the number of
runs is too high, we don't care.
--
Miroslav Lichvar
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