|Date: ||Sat, 4 Apr 2009 15:07:12 -0700|
|Reply-To: ||Jack Hamilton <jfh@STANFORDALUMNI.ORG>|
|Sender: ||"SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>|
|From: ||Jack Hamilton <jfh@STANFORDALUMNI.ORG>|
|Subject: ||Re: Heteroscedasticity|
|Content-Type: ||text/plain; charset=US-ASCII; format=flowed; delsp=yes|
On Apr 4, 2009, at 2:51 pm, Michael Raithel wrote:
> Dear SAS-L-ers,
> Priyanka posted the following:
>> Dear all,
>> I want to check for the presence of heteroscedasticity in the
>> residuals of the regression that I ran. How to do it in SAS?
> Priyanka it looks like you got your answer from several talented SAS-
> L-ers, and I certainly won't be of any help on this topic.
> I just wanted to confess that the word "Heteroscedasticity" is my
> absolute favorite word on the 'L! I am not concerned about
> heteroscedasticity at my job, I have a vague idea of what
> heteroscedasticity means (http://en.wikipedia.org/wiki/Heteroskedasticity
> ), I don't really think about heteroscedasticity in my off hours, I
> never read articles concerned with heteroscedasticity, and I have
> never used it in a spoken sentence--except to say it under my breath
> in my office when reading an 'L posting. However, I have been
> fascinated by that word since I first read it on the 'L and never
> miss a posting concerning heteroscedasticity!
But you people never mention homoscedasticity! What kind of bigoted
list is this, anyway!
Videtis illam spirare libertatis auram
> All right; now you all know one (of my many) dark little SAS-L
> obsessions. I wonder if there are others on this list who are
> fascinated by words/topics that are either irrelevant to them...
> Priyanka, best of luck in all of your heteroscedasticity endeavors!
> I hope that this suggestion proves helpful now, and in the future!
> Of course, all of these opinions and insights are my own, and do not
> reflect those of my organization or my associates. All SAS code and/
> or methodologies specified in this posting are for illustrative
> purposes only and no warranty is stated or implied as to their
> accuracy or applicability. People deciding to use information in
> this posting do so at their own risk.
> Michael A. Raithel
> "The man who wrote the book on performance"
> E-mail: MichaelRaithel@westat.com
> Author: Tuning SAS Applications in the MVS Environment
> Author: Tuning SAS Applications in the OS/390 and z/OS Environments,
> Second Edition
> Author: The Complete Guide to SAS Indexes
> There is no greater impediment to the advancement of knowledge
> than the ambiguity of words. - Thomas Reid