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Date:   Tue, 11 Sep 2007 03:06:31 -0700
Reply-To:   yair <harel_yair@YAHOO.COM>
Sender:   "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:   yair <harel_yair@YAHOO.COM>
Organization:   http://groups.google.com
Subject:   How to calculate the coefficient in Logistic regression?
Comments:   To: sas-l@uga.edu
Content-Type:   text/plain; charset="iso-8859-8-i"

Hello, Does some one know how to estimate to coefficients in Proc Logistic? I took an example from SAS on-line support. (http://support.sas.com/ onlinedoc/913/docMainpage.jsp) the example is in "The Logistic Procedure"->"Getting Started".

This is the code:

data ingots; input Heat Soak r n @@; datalines; 7 1.0 0 10 14 1.0 0 31 27 1.0 1 56 51 1.0 3 13 7 1.7 0 17 14 1.7 0 43 27 1.7 4 44 51 1.7 0 1 7 2.2 0 7 14 2.2 2 33 27 2.2 0 21 51 2.2 0 1 7 2.8 0 12 14 2.8 0 31 27 2.8 1 22 51 4.0 0 1 7 4.0 0 9 14 4.0 0 19 27 4.0 1 16 ; proc logistic data=ingots; model r/n=Heat Soak; run;

and here are the results:

Analysis of Maximum Likelihood Estimates Parameter DF Estimate Standard Error Wald Chi- Square Pr > ChiSq Intercept 1 -5.5592 1.1197 24.6503 <.0001 Heat 1 0.0820 0.0237 11.9454 0.0005 Soak 1 0.0568 0.3312 0.0294 0.8639

My question is what are the mathmatical calculations to get: -5.5592, 0.0820, 0.0568. Thanks


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