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st: RE: A continuous DV between 0 and 1


From   "Carter Ivan Rees" <CRees1@uwyo.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: A continuous DV between 0 and 1
Date   Thu, 7 Oct 2004 14:20:03 -0600

Eugene,

I would think that if it is a ratio variable an OLS regression would suffice.  OLS is pretty robust when it comes to its assumptions so the S shape may not be a problem.  However, your definition of "somewhat" S shaped has to be considered.  If it is truly an S-shaped (binomial) distribution you should check to see if you can identify a logical cut point and turn your DV into a categorical 0/1 variable and run a logistic regression.  If not a simple 0/1, maybe multinomial or ordinal regression would be the way to go.  In any event, if you do decide on a categorical DV check out Scott Long's Regression Models for Categorical Dependent Variables Using Stata.

Carter


*******************************************
Carter Rees, M.A.
Associate Research Scientist
Wyoming Survey & Analysis Center
710 Garfield St.
Suite 320
Laramie, WY 82072
307-399-0496
*******************************************
________________________________________
From: Kang, Eugene [mailto:EKang@cgsb.tamu.edu] 
Sent: Thursday, October 07, 2004 1:23 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: A continuous DV between 0 and 1

Hi All,

I am using STATA 8 to analyze a model with a ratio DV ranging from 0 to 1. The distribution of this DV is somewhat S-shaped. I was wondering if someone could point me to the correct statistical analysis to use (I can read the STATA manual and other books from there on). I know that this is a simple question, but any assistance would be greatly appreciated! Thanks!

Eugene


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