Date: Tue, 11 Sep 2007 10:53:17 -0700
Reply-To: Robin High <robinh@UOREGON.EDU>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: Robin High <robinh@UOREGON.EDU>
Subject: Re: How to calculate the coefficient in Logistic regression?
In-Reply-To: A<1189505191.300181.50260@y42g2000hsy.googlegroups.com>
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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
