Binomial Logistic Regression An Interactive Tutorial for SPSS 10.0 for Windows©

by
Julia Hartman

1. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
11
An Interactive Tutorial for SPSS 10.0 for
Windows
©
by
Julia Hartman
Binomial Logistic Regression
Next

2. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
22
Binomial Logistic Regression:Binomial Logistic Regression:
IntroductionIntroduction
Next
According to SPSS Help, Logistic Regression:
…is useful for situations in which you want to be able to
predict the presence or absence of a characteristic or outcome
based on values of a set of predictor variables. It is similar to a
linear regression model but is suited to models where the
dependent variable is dichotomous. Logistic regression
coefficients can be used to estimate odds ratios for each of the
independent variables in the model.

3. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
33
Binomial Logistic Regression:Binomial Logistic Regression:
IntroductionIntroduction
This tutorial will use logistic regression to
determine if the year of matriculation, gender,
and US Medical Licensing Exam (Part 2) scores
be used to predict whether or not physicians are
board-certified in a primary care specialty
(Family Medicine, Internal Medicine, Pediatrics,
Ob-Gyn).
Next

4. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
44
Binomial Logistic Regression:Binomial Logistic Regression:
IntroductionIntroduction
•Independent variables (covariates)
matyr: Matriculation year (continuous)
gender: Gender of student (1 = female, 2 = male)
usmle2: USMLE Step 2 (continuous)
•Dependent variable
primcare: Board certified in Primary Care specialty
Next

5. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
55
Binomial Logistic Regression:Binomial Logistic Regression:
Starting the ProcedureStarting the Procedure
•In the menu, click
Analyze

6. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
66
Binomial Logistic Regression: Binomial Logistic Regression:
Starting the ProcedureStarting the Procedure
•In the menu, click on
Analyze
•Point to
Regression

7. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
77
•In the menu, click on
Analyze
•Point to
Regression
•Point to Binary Logistic…
Binomial Logistic Regression: Binomial Logistic Regression:
Starting the ProcedureStarting the Procedure

8. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
88
•In the menu, click on
Analyze
…and click.
•Point to
Regression
•Point to Binary Logistic…
Binomial Logistic Regression: Binomial Logistic Regression:
Starting the ProcedureStarting the Procedure

9. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
99
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Choose the variables
for analysis from the
list in the variable box.
Scroll down the list,

10. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1010
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Choose the variables
for analysis from the
list in the variable box.
Scroll down the list,
point to primcare (the
dependent variable),
which is labeled
Board Certified in FM,

11. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1111
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Choose the variables
for analysis from the
list in the variable box.
…and click.
Scroll down the list,
point to primcare (the
dependent variable),
which is labeled
Board Certified in FM,
IM, Peds or Ob-Gyn

12. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1212
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Move primcare to the
box labeled
Dependent by
clicking the arrow.

13. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1313
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Scroll back up the
variable list,

14. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1414
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Scroll back up the
variable list,
point to
MATRICULATON DATE –
YEAR [matyr]
…and click.

15. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1515
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Move matyr to the
box labeled
Covariates by
clicking the arrow.

16. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1616
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Point to
GENDER OF STUDENT

17. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1717
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
…and click.
Point to
GENDER OF STUDENT
[gender]

18. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1818
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Move gender to the
box labeled
Covariates by
clicking the arrow.

19. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
1919
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Scroll down the
variable list,

20. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2020
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Scroll down the
variable list,
point to
USMLE STEP 2 TOTAL

21. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2121
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
…and click.
Scroll down the
variable list,
point to
USMLE STEP 2 TOTAL
[usmle2]

22. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2222
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting VariablesSelecting Variables
Move usmle2 to the
box labeled
Covariates by
clicking the arrow.

23. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2323
Binomial Logistic Regression: Binomial Logistic Regression:
Categorical VariablesCategorical Variables
To designate
gender as a
categorical
variable, click the
button labeled
Categorical.

24. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2424
Binomial Logistic Regression: Binomial Logistic Regression:
Categorical VariablesCategorical Variables
Click gender in the box
labeled Covariates

25. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2525
Binomial Logistic Regression: Binomial Logistic Regression:
Categorical VariablesCategorical Variables
Click gender in the box
labeled Covariates,
then click the arrow to
move it to the box
labeled Categorical
Covariates.

26. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2626
Binomial Logistic Regression: Binomial Logistic Regression:
Categorical VariablesCategorical Variables
Click the Continue
button.

27. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2727
Binomial Logistic Regression: Binomial Logistic Regression:
Specifying OptionsSpecifying Options
Specify options
by clicking the
button labeled
Options…

28. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2828
Binomial Logistic Regression: Binomial Logistic Regression:
Specifying OptionsSpecifying Options
Click the
checkbox for
Classification plots.

29. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
2929
In SPSS, you can
display information
by right-clicking,
but right-clicking
doesn’t work in this
tutorial.
To see what would
happen, left-click
the box for Hosmer-Lemeshow goodness-of-fit.
Binomial Logistic Regression: Binomial Logistic Regression:
Specifying OptionsSpecifying Options

30. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3030
Binomial Logistic Regression: Binomial Logistic Regression:
Specifying OptionsSpecifying Options
For this tutorial,
click the checkbox
for
Hosmer-Lemeshow
goodness-of-fit.

31. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3131
Binomial Logistic Regression: Binomial Logistic Regression:
Specifying OptionsSpecifying Options
Click the Continue
button.

32. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3232
The covariates can be
entered into the analysis
using six different
methods. This tutorial
includes the Enter and
Forward: LR methods.
Choose one of the
following:
Binomial Logistic Regression: Binomial Logistic Regression:
Selecting a Method of EntrySelecting a Method of Entry
•Enter
•Forward: LR
Click the printer for an important note
about printing output with
classification plots.

33. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3333
Enter is the default
method of entering
covariates.
Click the OK button
to run the procedure.
Binomial Logistic Regression: Binomial Logistic Regression:
Enter MethodEnter Method

34. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3434
Binomial Logistic Regression Output Binomial Logistic Regression Output
Case Processing SummaryCase Processing Summary
The labels and format
of your output may be
somewhat different.
Next

35. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3535
Binomial Logistic Regression Output Binomial Logistic Regression Output
Variable CodingVariable Coding
Next

36. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3636
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Beginning Block: Classification TableBeginning Block: Classification Table
Next

37. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3737
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Beginning Block: Variables in the EquationBeginning Block: Variables in the Equation
Next

38. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3838
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Chi-Square Tests of CoefficientsChi-Square Tests of Coefficients
Next

39. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
3939
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Model SummaryModel Summary
Next

40. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4040
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Hosmer-Lemeshow Contingency TableHosmer-Lemeshow Contingency Table
Next

41. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4141
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Classification TableClassification Table
Next

42. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4242
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Variables in the EquationVariables in the Equation
Next

43. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4343
Binomial Logistic Regression Output (Enter Method)Binomial Logistic Regression Output (Enter Method)
Classification PlotClassification Plot
Next

44. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4444
•Return to the list of tutorials
An Interactive Tutorial for An Interactive Tutorial for
SPSS 10.0 for WindowsSPSS 10.0 for Windows
©©
::
Binomial Logistic RegressionBinomial Logistic Regression
•Repeat this tutorial
Choose one of the following:
•Select the Forward: LR method of entry

45. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4545
Binomial Logistic Regression: Binomial Logistic Regression:
Forward: LR MethodForward: LR Method
To select the Forward:
LR (Likelihood Ratio)
method of covariate
entry, click the drop-
down arrow for
Method (next to Enter,
which is the default
method).

46. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4646
Binomial Logistic RegressionBinomial Logistic Regression
Forward: LR MethodForward: LR Method
Point to
Forward: LR

47. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4747
Binomial Logistic RegressionBinomial Logistic Regression
Forward: LR MethodForward: LR Method
Point to
Forward: LR
and click.

48. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4848
Binomial Logistic RegressionBinomial Logistic Regression
Forward: LR MethodForward: LR Method
Click the OK
button to run
the procedure.

49. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
4949
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Case Processing SummaryCase Processing Summary
The labels and format
of your output may be
somewhat different.
Next

50. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5050
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Variable CodingVariable Coding
Next

51. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5151
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Beginning Block: Classification TableBeginning Block: Classification Table
Next

52. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5252
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Beginning Block: Variables in the EquationBeginning Block: Variables in the Equation
Next

53. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5353
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Chi-Square Tests of CoefficientsChi-Square Tests of Coefficients
Next

54. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5454
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Model SummaryModel Summary
Next

55. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5555
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Hosmer-Lemeshow Contingency TableHosmer-Lemeshow Contingency Table
Next

56. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5656
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Hosmer-Lemeshow Contingency TableHosmer-Lemeshow Contingency Table
Next

57. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5757
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Hosmer-Lemeshow Contingency TableHosmer-Lemeshow Contingency Table
Next

58. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5858
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Classification TableClassification Table
Next

59. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
5959
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Variables in the EquationVariables in the Equation
Next

60. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6060
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Model if Term RemovedModel if Term Removed
Next

61. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6161
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Variables not in the EquationVariables not in the Equation
Next

62. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6262
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Classification Plot for Step 1Classification Plot for Step 1
Next

63. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6363
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Classification Plot for Step 2Classification Plot for Step 2
Next

64. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6464
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Classification Plot for Step 3Classification Plot for Step 3
Next

65. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6565
•Return to the list of tutorials
An Interactive Tutorial for An Interactive Tutorial for
SPSS 10.0 for WindowsSPSS 10.0 for Windows
©©
::
Binomial Logistic RegressionBinomial Logistic Regression
•Repeat this tutorial
Click one of the following:
•Select the Enter method of entry

66. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6666
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Next
SPSS WILL CRASH if you try to print logistic
regression output which includes classification plots.
•You can avoid this problem by printing the output in
two parts. Click the button to learn how.
•For more information, click the link below:
http://www.spss.com/tech/answer/result.cfm?tech_tan_id=100007850

67. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6767
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
The classification plot(s)
must be printed separately
from the rest of the output.
In SPSS, you would begin
by right-clicking the plot,
but right-clicking doesn’t
work in this tutorial.
Click the classification
plot.

68. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6868
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Right-clicking opens
the shortcut menu.
•Click SPSS Rtf
Document Object.

69. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
6969
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Right-clicking opens
the shortcut menu.
•Click SPSS Rtf
Document Object.
•Then point to
Open

70. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7070
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Right-clicking opens
the shortcut menu.
•Point to
SPSS Rtf
Document Object.
•Then point to
Open
…and click

71. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7171
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Print the plot from
this new window.
•Click File
This output file has
been saved as
logistic (enter 3).spo
Your window will be
different.

72. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7272
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Print the plot from this new
window.
•Click File
•Then point to Print

73. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7373
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Print the plot from this new
window.
•Click File
•Then point to Print
•Click to print the plot
Of course, the plot won’t
print from this tutorial!

74. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7474
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Close the window.
•Click File

75. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7575
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Close the window.
•Click File
•Then click
Exit & Return to (the file
name--in this example)
logistic (enter 3).spo
Next

76. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7676
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
In SPSS you would
delete the classification
plot (still selected) by
pressing the delete key,
but that won’t work in
this tutorial.
Next

77. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7777
Binomial Logistic Regression Output (Forward: LR Method)Binomial Logistic Regression Output (Forward: LR Method)
Printing Logistic Regression OutputPrinting Logistic Regression Output
Next
Print the rest of the output
as usual, either from the
File menu or by clicking
the print button
on the toolbar.
Remember, you can’t print from
the tutorial.

78. © Copyright 2000, Julia Hartman © Copyright 2000, Julia Hartman
7878
•Resume this tutorial
•Return to the list of tutorials
An Interactive Tutorial for An Interactive Tutorial for
SPSS 10.0 for WindowsSPSS 10.0 for Windows
©©
::
Binomial Logistic RegressionBinomial Logistic Regression
•Repeat this tutorial
Choose one of the following: