Date:         Fri, 4 Nov 2005 08:12:51 -0500
Reply-To:     Hari Nath <hari_s_nath@YAHOO.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Hari Nath <hari_s_nath@YAHOO.COM>
Subject:      Re: Stderror, Error Stdev, Residual error ???/ Are they same
Comments: To: Paul Swank <Paul.R.Swank@UTH.TMC.EDU>

Paul R. Swank,
   Thanks for your explanation. The standard error and residual error are
fine but the term "error standard deviation" is quite confusing. I was
really interpreting that as the difference between the total standard
deviation minus the differences in main effects. Will check with that.

thanks again
hari


On Thu, 3 Nov 2005 14:47:54 -0600, Swank, Paul R <Paul.R.Swank@UTH.TMC.EDU>
wrote:

>The residual error is the difference between the model proedicted Y and
>the actual value of Y. The error standard deviation is the root mean
>square error which is a function of the residual errors, the sum of
>squared residuals divided by the degrees of freedom for the error term.
>The standard error is the standard deviation of a sample statistic such
>as the mean of the regression coefficient. The standard error depends on
>the residual standard deviation. In regression, for example, the
>standard error of a regression coefficient is a function of the ratio of
>the sums of squares for the predictor and the sum of squared errors.
>
>
>Paul R. Swank, Ph.D.
>Professor, Developmental Pediatrics
>Director of Research, Center for Improving the Readiness of Children for
>Learning and Education (C.I.R.C.L.E.)
>Medical School
>UT Health Science Center at Houston
>
>-----Original Message-----
>From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of
>Hari Nath
>Sent: Thursday, November 03, 2005 2:12 PM
>To: SAS-L@LISTSERV.UGA.EDU
>Subject: Re: Stderror, Error Stdev, Residual error ???/ Are they same
>
>On Thu, 3 Nov 2005 08:32:34 -0500, Hari Nath <hari_s_nath@YAHOO.COM>
>wrote:
>
>>Hi all,
>>   Are the terms residual error, Standard error and error standard
>>deviation are the same?? If yes, then all the 3 terms describes the
>>variablility that remains after all the main effects and/or interaction
>
>>effects have been segregated. If not/ those terms are different, then
>>does the error standard deviation mean the difference of(total standard
>
>>deviation & differences in main effects and/or interaction effects)??
>>
>>Can somebody make this point clear to me!!
>>
>>Thanks in advance,
>>
>>hari