```Date: Mon, 2 Oct 2006 11:27:28 -0400 Reply-To: Scott Czepiel Sender: "SAS(r) Discussion" From: Scott Czepiel Subject: Re: logistic regression In-Reply-To: <2CA33C37A5A1FA4E8B3DD50B36E11C6F3F1FB1@nnmc-exch4.nnmc.med.navy.mil> Content-Type: text/plain; charset=ISO-8859-1; format=flowed In CATMOD and LOGISTIC, the default is for the largest value to be the omitted value. Thus, for a binary dependent variable, this will model the probability of occurence of the smallest value. For this reason, it is common to see binary variables in SAS coded as 1=yes, 2=no (rather than 1/0). On 10/2/06, Cecilia Kim wrote: > > It means that you're predicting the probability of a nonevent. > You need to use DESCENDING option to change this to predicting the > probability of an event (dep_var = 1). > Cecilia > > Cecilia H. Kim, MPH > Nurse Researcher > Comprehensive Colon Cancer Center Initiative > National Naval Medical Center > 8901 Wisconsin Avenue > Bethesda, MD 20889 > Office (301) 319-5015 > PIN 1063751 > -----Original Message----- > From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of Jing > Quan > Sent: Monday, October 02, 2006 10:47 AM > To: SAS-L@LISTSERV.UGA.EDU > Subject: logistic regression > > In an SAS output, I see "Probability modeled is dep_var=0." What does > it mean? The reason I'm a little confused is that I understand the > estimation is done for prob (dep_var=1). > > Thanks for your help. > > > Regards, > > Jing "Jim" Quan > Dept of Info and Decision Sciences > Salisbury University > This document may contain information covered under the Privacy Act, 5 USC > 552(a), and/or the Health Insurance Portability and Accountability Act (PL > 104-191) and its various implementing regulations and must be protected in > accordance with those provisions. Healthcare information is personal and > sensitive and must be treated accordingly. If this correspondence contains > healthcare information it is being provided to you after appropriate > authorization from the patient or under circumstances that don't require > patient authorization. You, the recipient, are obligated to maintain it in > a > safe, secure and confidential manner. Redisclosure without additional > patient consent or as permitted by law is prohibited. Unauthorized > redisclosure or failure to maintain confidentiality subjects you to > application of appropriate sanction. If you have received this > correspondence in error, please notify the sender at once and destroy any > copies you have made. > ```

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