From owner-freebsd-current  Tue Jul 15 13:07:06 1997
Return-Path: <owner-current>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id NAA21299
          for current-outgoing; Tue, 15 Jul 1997 13:07:06 -0700 (PDT)
Received: from khavrinen.lcs.mit.edu (khavrinen.lcs.mit.edu [18.24.4.193])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id NAA21288;
          Tue, 15 Jul 1997 13:06:56 -0700 (PDT)
Received: (from wollman@localhost)
	by khavrinen.lcs.mit.edu (8.8.5/8.8.5) id QAA12902;
	Tue, 15 Jul 1997 16:06:54 -0400 (EDT)
Date: Tue, 15 Jul 1997 16:06:54 -0400 (EDT)
From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Message-Id: <199707152006.QAA12902@khavrinen.lcs.mit.edu>
To: "Jonathan M. Bresler" <jmb@FreeBSD.ORG>
Cc: current@FreeBSD.ORG
Subject: Re: Ping with standard deviation?
In-Reply-To: <199707152004.NAA21101@hub.freebsd.org>
References: <199707151921.PAA12803@khavrinen.lcs.mit.edu>
	<199707152004.NAA21101@hub.freebsd.org>
Sender: owner-current@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

<<On Tue, 15 Jul 1997 13:04:08 -0700 (PDT), "Jonathan M. Bresler" <jmb@FreeBSD.ORG> said:

> 	std dev and avg (ping already prints avg) are very sensitive
> 	to outliers.  how using the statistics suggested by vern paxson
> 	instead?  median in place of average and inter-quartile range
> 	in place of std deviation.  (from memory, i'll have to get
> 	the phd thesis to check).

I'd prefer something that's easy to compute and doesn't require O(N)
storage.

-GAWollman

--
Garrett A. Wollman   | O Siem / We are all family / O Siem / We're all the same
wollman@lcs.mit.edu  | O Siem / The fires of freedom 
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA|                     - Susan Aglukark and Chad Irschick