Date:         Fri, 12 Jan 2007 13:19:06 -0800
Reply-To:     Reeza <fkhurshed@HOTMAIL.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Reeza <fkhurshed@HOTMAIL.COM>
Organization: http://groups.google.com
Subject:      Re: normality of residuals: opinions?
Comments: To: sas-l@uga.edu
In-Reply-To:  <Pine.GSO.4.58.0701121546020.26687@leukothea>
Content-Type: text/plain; charset="us-ascii"

Hi,

Looks like your residuals do not pass the tests for normality, and
assuming your errors are in some order relative to the data collection
or observation there also appears to be some evidence of cyclical
patterns.  time series data?

HTH,
Reeza


Kevin Roland Viel wrote:
> Sorry to burden the listserv like this, but I wanted to get a second
> opinion concerning the distribution of residuals from a REG procedure
> regression.  The question before me is whether I should log transform the
> IV.  The data follow my signature.
>
> Thank you,
>
> Kevin
>
> Kevin Viel
> PhD Candidate
> Department of Epidemiology
> Rollins School of Public Health
> Emory University
> Atlanta, GA 30322
>
> data resid ;
>   input e @@ ;
>   datalines ;
> -30.82552643 -21.3397105 -37.03212775 -6.420253898 -4.354539771
> -27.2464255 38.035531435 -23.69146352 -6.295435679 32.93315834
> -25.45056947 11.559333487 44.649008708 0.7401886498 -11.34197641
> 75.654991983 27.065480629 6.5301495758 25.116686186 -42.42766114
> -28.68553979 -4.458576944 9.4224713083 -8.277536206 -5.501828368
> -15.01747873 -9.267722824 8.2923232704 -48.70029662 -8.669815104
> -17.30691322 -14.45618494 -5.431568241 2.9701606043 -14.12689768
> 25.867878883 -5.549436378 -16.61588548 -5.140802417 14.190768964
> 26.19022189 -3.770819422 16.146057087 -17.41983058 18.742408056
> 24.064531123 8.3084245874 -13.57537732 -15.85003324 -2.502443873
> -5.359669937 43.545680751 8.3160052269 -12.14286283 25.592035526
> -15.55366141 -1.723769179 12.429297769 -31.86569333 72.064009603
> 6.1304383827 -18.81436701 1.7995950816 -11.30635246 34.688168224
> -10.86488365 -19.68057313 -10.07652613 -4.248687026 3.986568116
> 25.930058644 -4.489291724 -14.9272115 4.1168488701 -15.82953122
> -2.3813471 35.920661539 -14.98403741
> ;
> run ;
>
> proc univariate data = resid normal plot ;
>   var e ;
> run ;