Gay Marriage Logistic Regression Example

Free Syntax to cut-and-paste!

set width=80/length=none/header=no/messages=none.
get file="/homes/josephf/webstats/CCFRpop.sav".
set width=80/length=none/header=no/messages=none.
get file="/homes/josephf/webstats/CRIC2002.sav".
*Missing values
missing values q7 (99)
missing values q44 (99)
missing values AGE (888)
missing values Q42 (99)
*Recodes
recode q7 (1,2=1)(3,4=0)
recode q44 (5=0)(4=1)(3=2)(2=3)(1=4)
recode Q42 (1 thru 3=1) (4,5=2) (6 thru 8=3)
*Value labels
value labels q7 1'Support' 0'Oppose'
value labels AGE 3'old' 2'middle' 1'young'
value labels q42 1'basic' 2'intermediate' 3'high'
*Regression
LOGISTIC REGRESSION /VARIABLES q7 WITH q44 q42 age
finish.

Output:

      Total number of cases:      1402 (Unweighted)
      Number of selected cases:   1402
      Number of unselected cases: 0

      Number of selected cases:                 1402
      Number rejected because of missing data:  129
      Number of cases included in the analysis: 1273



Dependent Variable Encoding:

Original       Internal
Value          Value
 0             0
 1             1

Dependent Variable..   Q7         7. Do you strongly support, support, oppose or
 strongly oppose allowing gay and lesbian couples to marry?

Beginning Block Number  0.  Initial Log Likelihood Function

-2 Log Likelihood   1724.7748

* Constant is included in the model.


Beginning Block Number  1.  Method: Enter

Variable(s) Entered on Step Number
1..       Q44       44. Other than events like weddings and funerals, how often
do you attend a religious service?
          Q42       42. What is the highest level of education you have reached?
          AGE       41. Age?

Estimation terminated at iteration number 3 because
Log Likelihood decreased by less than .01 percent.

 -2 Log Likelihood     1493.279
 Goodness of Fit       1273.759

                     Chi-Square    df Significance

 Model Chi-Square       231.496     3        .0000
 Improvement            231.496     3        .0000

Classification Table for Q7
                        Predicted
                     Oppose  Support    Percent Correct
                        O   |    S
Observed           +--------+--------+
   Oppose      O   |   262  |   262  |   50.00%
                   +--------+--------+
   Support     S   |   137  |   612  |   81.71%
                   +--------+--------+
                                Overall  68.66%

---------------------- Variables in the Equation -----------------------

Variable           B      S.E.     Wald    df      Sig       R   Exp(B)

Q44           -.4433     .0429 106.7756     1    .0000  -.2465    .6419
Q42            .2436     .0771   9.9786     1    .0016   .0680   1.2758
AGE           -.0290     .0041  50.5643     1    .0000  -.1678    .9714
Constant      1.9060     .2700  49.8276     1    .0000


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