Date: Tue, 11 Sep 2007 10:53:17 -0700 Reply-To: Robin High Sender: "SAS(r) Discussion" From: Robin High Subject: Re: How to calculate the coefficient in Logistic regression? Comments: To: yair In-Reply-To: A<1189505191.300181.50260@y42g2000hsy.googlegroups.com> Content-Type: text/plain; charset="us-ascii" You should look at a book on "Generalized Linear Models"; e.g., Chapter 7 of the 2nd ed. of a book with that title by Annette Dobson is a good starting point with a similar example to the one you included. Also, books on Logistic Regression also provide details. Robin High University of Oregon -----Original Message----- From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of yair Sent: Tuesday, September 11, 2007 3:07 AM To: SAS-L@LISTSERV.UGA.EDU Subject: How to calculate the coefficient in Logistic regression? 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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