Re: logistic regression question
Posted by
lori.andersen on
Dec 05, 2011; 2:06am
URL: http://spssx-discussion.165.s1.nabble.com/logistic-regression-question-tp5047539p5047649.html
Exp(1.471) = 4.35, that is your odds ratio
Is your independent variable categorical?
If not, a one unit increase in your IV would yield a 335% greater chance of membership in the "1" value of your DV.
If it is categorical, members of the IV group at the "1" level have a 335% greater chance of membership in the "1" value of the DV.
Lori
On Sun, Dec 4, 2011 at 7:49 PM, Jordan Kennedy [via SPSSX Discussion]
<[hidden email]> wrote:
Hello all:
I have run a simple bivariate logistic regression SPSS 19 for Windows.
The predictor is significantly associated with the outcome--with a
fairly large Odds Ratio. However, the classification table listed does
not classify particularly well. I have pasted the output below. Any
help would be greatly appreciated.
Classification Table(a)
Predicted
o_adhdalc
Observed .00 1.00 Percentage Correct
Step 1 o_adhdalc .00 209 0 100.0
1.00 74 0 .0
Overall Percentage 73.9
Variables in the Equation
B S.E. Wald df Sig. Exp(B)
Step 1a p2_alcadhd_l 1.471 .298 24.377 1 .000
Constant -3.335 .512 42.450 1 .000 .036
Thank you!
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--
Lori Andersen
Ph.D. student, Educational Policy, Planning & Leadership
College of William & Mary
Williamsburg, VA