Date:         Sat, 25 Jun 2005 13:14:44 -0700
Reply-To:     tanwan <tanwanzang@YAHOO.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         tanwan <tanwanzang@YAHOO.COM>
Organization: http://groups.google.com
Subject:      On Proc SurveyReg
Comments: To: sas-l@uga.edu
Content-Type: text/plain; charset="iso-8859-1"

Greetings to the Learned SAS-L Community.


I get an error but I do not know how to decipher it. What does the
following error message mean?:

Matrix X'WX is singular and a generalized inverse was used to solve the
normal equations.  Estimates are not unique.

What are its implications, if any?

Thanks in advance.

P