>
=========================================================================
Date:         Wed, 19 Feb 2003 02:07:04 -0800
Reply-To:     Bruce Bradbury <BruceBrad@INAME.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Bruce Bradbury <BruceBrad@INAME.COM>
Organization: http://groups.google.com/
Subject:      Re: dependent var with zeros and fixed effects or clustering
              (symmetrically trimmed least squares??)
Content-Type: text/plain; charset=ISO-8859-1

> I am writing because I was wondering what procedure I could use in SAS
> or other statistical software to analyze a dependent variable that has
> many zeros, if at the same time I want to use fixed effects or
> clustering in the regression equation (because it is a very short
> [i.e. 2-period] panel).  The fixed effects or clustering does not
> allow one to use Tobit.  I saw a reference to symmetrically trimmed
> least squares for this situation.  Any ideas how I could do this or an
> alternative estimation for this problem?