Return-Path: william@bourbon.usc.edu Delivery-Date: Wed Sep 24 18:17:06 2008 X-Spam-Checker-Version: SpamAssassin 3.2.3 (2007-08-08) on merlot.usc.edu X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=3.2.3 Received: from bourbon.usc.edu (bourbon.usc.edu [128.125.9.75]) by merlot.usc.edu (8.14.1/8.14.1) with ESMTP id m8P1H50r005559 for ; Wed, 24 Sep 2008 18:17:05 -0700 Received: from bourbon.usc.edu (localhost.localdomain [127.0.0.1]) by bourbon.usc.edu (8.14.2/8.14.1) with ESMTP id m8P1K4ia006235 for ; Wed, 24 Sep 2008 18:20:04 -0700 Message-Id: <200809250120.m8P1K4ia006235@bourbon.usc.edu> To: cs551@merlot.usc.edu Subject: Re: Unit for std deviation Date: Wed, 24 Sep 2008 18:20:04 -0700 From: Bill Cheng Someone wrote: > Does standard devation value have a unit? I am using seconds.  Variance of X has the same unit as the square of X. Since standard deviation is the square of variance, standard deviation of X should have the same unit as X. -- Bill Cheng // bill.cheng@usc.edu