ANOVA_SPSS

8/2/2019 ANOVA_SPSS

1/65

Copyright 2000, 1

An Interactive Tutorial for SPSS 10.0 for Windows

Factorial

Analysis of Variance

by

Julia Hartman

Next

8/2/2019 ANOVA_SPSS

2/65

Copyright 2000, 2

Factorial ANOVA:

Introduction

In this tutorial, Factorial Analysis of Variance

(ANOVA) will be used to determine whethergender and residency location interact to affect

scores on the US Medical Licensing Exam

(Part 2) scores.

Next

8/2/2019 ANOVA_SPSS

3/65

Copyright 2000, 3

Factorial ANOVA:

Introduction

Independent variables (fixed factors)

gender: Gender of student (1 = female, 2 = male)

resloc: Residency location

(1 = in-state, 2 = out of state)

Dependent variable usmle2: USMLE Step 2 (continuous)

Next

8/2/2019 ANOVA_SPSS

4/65

Copyright 2000, 4

Factorial ANOVA:

Starting the Procedure

In the menu, click

Analyze

8/2/2019 ANOVA_SPSS

5/65

Copyright 2000, 5

Factorial ANOVA:


In the menu, click on

Analyze

Point to

General Linear Model

8/2/2019 ANOVA_SPSS

6/65

Copyright 2000, 6

Factorial ANOVA:



Analyze

Point to


Point to Univariate

8/2/2019 ANOVA_SPSS

7/65 Copyright 2000, 7

Factorial ANOVA:



Analyze

Point to


Point to Univariate

and click.

8/2/2019 ANOVA_SPSS


Factorial ANOVA:

Selecting Variables

Choose the variables

for analysis from the

list in the variablebox.

For this tutorial,

begin by pointing to

the variable labeledGENDER OF STUDENT

8/2/2019 ANOVA_SPSS


Factorial ANOVA:

Selecting Variables

Choose the variables

for analysis from the

list in the variablebox.

For this tutorial,

begin by pointing to

the variable labeledGENDER OF STUDENT

and click.

8/2/2019 ANOVA_SPSS

10/65 Copyright 2000, 10

Factorial ANOVA:

Selecting Variables

Move gender, a

categorical variable, tothe box labeled

Fixed Factor(s)by

clicking the arrow.

8/2/2019 ANOVA_SPSS

11/65 Copyright 2000, 11

Factorial ANOVA:

Selecting Variables

Scroll down the list,

point to the variableresloc, which is labeled

RESIDENCY LOCATION,

8/2/2019 ANOVA_SPSS

12/65 Copyright 2000, 12

Factorial ANOVA:

Selecting Variables

Scroll down the list,

point to the variableresloc, which is labeled

RESIDENCY LOCATION,

and click.

8/2/2019 ANOVA_SPSS

13/65 Copyright 2000, 13

Factorial ANOVA:

Selecting Variables

Move resloc, another

categorical variable, tothe box labeled

Fixed Factor(s) by

clicking the arrow.

8/2/2019 ANOVA_SPSS

14/65 Copyright 2000, 14

Factorial ANOVA:

Selecting Variables

Scroll further down

the list and point tothe variable usmle2,

which is labeled

USMLE STEP 2,

8/2/2019 ANOVA_SPSS

15/65 Copyright 2000, 15

Factorial ANOVA:

Selecting Variables

and click.

Scroll further down

the list and point tothe variable usmle2,

which is labeled

USMLE STEP 2 TOTAL,

8/2/2019 ANOVA_SPSS

16/65 Copyright 2000, 16

Factorial ANOVA:

Selecting Variables

Move usmle2, a

continuous variable, tothe box labeled

Dependent Variableby

clicking the arrow.

Move usmle2, a

continuous variable, tothe box labeled

Dependent Variableby

clicking the arrow.

8/2/2019 ANOVA_SPSS

17/65 Copyright 2000, 17

Factorial ANOVA:

Tutorial Options

The Univariate GLM

procedure offers a

number of options.

for a list of the options

included in this tutorial.

Click this button

8/2/2019 ANOVA_SPSS

18/65 Copyright 2000, 18

Factorial ANOVA:

List of Tutorial Options

Profile plots of estimated

marginal means

Post hoc tests for pairwise

multiple comparisons

Optional descriptive anddiagnostic statistics

Click the box for the desired option.

Continue with the analysis

8/2/2019 ANOVA_SPSS

19/65

Copyright 2000, 19

Factorial ANOVA:



marginal means






8/2/2019 ANOVA_SPSS

20/65

Copyright 2000, 20

Factorial ANOVA:



marginal means






8/2/2019 ANOVA_SPSS

21/65

Copyright 2000, 21

Factorial ANOVA:



marginal means






8/2/2019 ANOVA_SPSS

22/65

Copyright 2000, 22

Factorial ANOVA:

Profile Plots

Request profile plots

of estimated marginalmeans by clicking the

button labeledPlots

8/2/2019 ANOVA_SPSS

23/65

Copyright 2000, 23

Factorial ANOVA:

Profile Plots

This tutorial requests

both available profile

plots, gender*reslocand resloc*gender.

Clickgender in the

Factorsbox.

8/2/2019 ANOVA_SPSS

24/65

Copyright 2000, 24

Factorial ANOVA:

Profile Plots

Move gender to theHorizontal Axisbox by

clicking the arrow.

8/2/2019 ANOVA_SPSS

25/65

Copyright 2000, 25

Factorial ANOVA:

Profile Plots

Now clickresloc inthe Factorsbox

8/2/2019 ANOVA_SPSS

26/65

Copyright 2000, 26

Factorial ANOVA:

Profile Plots

and move it to theSeparate Linesbox

by clicking the arrow.

8/2/2019 ANOVA_SPSS

27/65

Copyright 2000, 27

Factorial ANOVA:

Profile Plots

Click the Add buttonto request the plot.

8/2/2019 ANOVA_SPSS

28/65

Copyright 2000, 28

Factorial ANOVA:

Profile Plots

To request the plot of

resloc*gender,clickresloc in the

Factorsbox.

8/2/2019 ANOVA_SPSS

29/65

Copyright 2000, 29

Factorial ANOVA:

Profile Plots

Move resloc to theHorizontal Axisbox by

clicking the arrow.

8/2/2019 ANOVA_SPSS

30/65

Copyright 2000, 30

Factorial ANOVA:

Profile Plots

Now clickgender inthe Factorsbox

8/2/2019 ANOVA_SPSS

31/65

Copyright 2000, 31

Factorial ANOVA:

Profile Plots

and move it to theSeparate Linesbox

by clicking the arrow.

8/2/2019 ANOVA_SPSS

32/65

Copyright 2000, 32

Factorial ANOVA:

Profile Plots

Click the Add buttonto request the plot.

8/2/2019 ANOVA_SPSS

33/65

Copyright 2000, 33

Factorial ANOVA:

Profile Plots

Click the Continuebutton.

8/2/2019 ANOVA_SPSS

34/65

Copyright 2000, 34

Factorial ANOVA:

Post Hoc Multiple Comparisons

(The factors in this analysis--

genderand resloc--eachhave only two categories, so

post hoc option is explained

only for tutorial purposes.)

To request post hoc

tests for pairwise

multiple comparisons,

click the Post Hoc

button.

8/2/2019 ANOVA_SPSS

35/65

Copyright 2000, 35

Factorial ANOVA:


This example

requests tests forgenderonly.

Clickgender in the

Factor(s) box.

8/2/2019 ANOVA_SPSS

36/65

Copyright 2000, 36

Factorial ANOVA:


Move gender to thePost Hoc Tests for:

box by clicking the

arrow.

8/2/2019 ANOVA_SPSS

37/65

Copyright 2000, 37

Factorial ANOVA:


Request multiple

comparison test(s) by

clicking in the

corresponding

checkbox.

For this tutorial,clickBonferroni.

8/2/2019 ANOVA_SPSS

38/65

Copyright 2000, 38

Factorial ANOVA:


In SPSS, you can

request as many

multiple comparison

tests as you want.

To continue the

tutorial, click theContinue button.

8/2/2019 ANOVA_SPSS

39/65

Copyright 2000, 39

Factorial ANOVA:

Optional Descriptive and

DiagnosticStatistics

To display estimated

marginal means,

parameter estimates,

and descriptive and

diagnostic statistics,

and or to change the

alpha level, click the

Options button.

8/2/2019 ANOVA_SPSS

40/65

Copyright 2000, 40

Factorial ANOVA:

Options: Estimated Marginal Means

You can request an overall

(grand) marginal mean, as

well as marginal meansfor the factors and the

interaction(s).

To select all of these atonce, first click

[OVERALL].

8/2/2019 ANOVA_SPSS

41/65

Copyright 2000, 41

Factorial ANOVA:


Hold the Shiftkey (on thekeyboard) and click

gender*resloc to select the

entire list.

8/2/2019 ANOVA_SPSS

42/65

Copyright 2000, 42

Factorial ANOVA:


Click the arrow to move

the factors and factor

interaction terms to the

Display Means for: box.

8/2/2019 ANOVA_SPSS

43/65

Copyright 2000, 43

Factorial ANOVA:


In SPSS, you can display

information by right-

clicking, but right-

clicking doesnt work in

this tutorial.

To see what right-clickingwould show, left-click

Compare main effects.

8/2/2019 ANOVA_SPSS

44/65

Copyright 2000, 44

Factorial ANOVA:


Click the checkbox for

Compare main effects.

8/2/2019 ANOVA_SPSS

45/65

Copyright 2000, 45

Factorial ANOVA:


You can change the

method used for

confidence interval

adjustments by selecting

from the drop-down list.

Click the drop-downarrow for Confidence

interval adjustment.

8/2/2019 ANOVA_SPSS

46/65

Copyright 2000, 46

Factorial ANOVA:


This tutorial will use the

default method, so click

elsewhere on the

window to close the

drop-down menu.

8/2/2019 ANOVA_SPSS

47/65

Copyright 2000, 47

Factorial ANOVA:

Selecting Options

Request other options by

clicking the appropriate

checkbox.

In the Display area, click

the checkbox for

Descriptive statistics

8/2/2019 ANOVA_SPSS

48/65

Copyright 2000, 48

Factorial ANOVA:

Selecting Options

and the one for

Homogeneity tests.

8/2/2019 ANOVA_SPSS

49/65

Copyright 2000, 49

Factorial ANOVA:

Selecting Options

This tutorial uses no more

options, so click the

Continue button.

8/2/2019 ANOVA_SPSS

50/65

Copyright 2000, 50

Factorial ANOVA:

Run the analysis

Click the OK button torun the Factorial

ANOVA.

8/2/2019 ANOVA_SPSS

51/65

Copyright 2000, 51

Factorial ANOVA Output:

Warnings and General Information

The labels and format

of your output may be

somewhat different.

Next

8/2/2019 ANOVA_SPSS

52/65

Copyright 2000, 52

Factorial ANOVA Output: :

Descriptive Statistics

NextPrevious

8/2/2019 ANOVA_SPSS

53/65

Copyright 2000, 53


Test of Equality of Error Variances

NextPrevious

8/2/2019 ANOVA_SPSS

54/65

Copyright 2000, 54


Tests of Between-Subjects Effects

NextPrevious

8/2/2019 ANOVA_SPSS

55/65

Copyright 2000, 55


Estimated Marginal Means:

Grand Mean

NextPrevious

8/2/2019 ANOVA_SPSS

56/65

Copyright 2000, 56

Factorial ANOVA:

Gender: Estimated Marginal Means

NextPrevious

8/2/2019 ANOVA_SPSS

57/65

Copyright 2000, 57

Factorial ANOVA:

Gender: Pairwise Comparisons

NextPrevious

8/2/2019 ANOVA_SPSS

58/65

Copyright 2000, 58

Factorial ANOVA:

Gender: Univariate Tests

NextPrevious

8/2/2019 ANOVA_SPSS

59/65

Copyright 2000, 59

Factorial ANOVA:

Resloc: Estimated Marginal Means

NextPrevious

8/2/2019 ANOVA_SPSS

60/65

Copyright 2000, 60

Factorial ANOVA:

Resloc: Pairwise Comparisons

NextPrevious

8/2/2019 ANOVA_SPSS

61/65

Copyright 2000, 61

Factorial ANOVA:

Resloc: Univariate Tests

NextPrevious

8/2/2019 ANOVA_SPSS

62/65

8/2/2019 ANOVA_SPSS

63/65

Copyright 2000, 63

Factorial ANOVA:

Profile Plot: Gender*Resloc

NextPrevious

8/2/2019 ANOVA_SPSS

64/65

Copyright 2000, 64

Factorial ANOVA:

Profile Plot: Resloc*Gender

NextPrevious

8/2/2019 ANOVA_SPSS

65/65

An Interactive Tutorial for

SPSS 10.0 for Windows:

Factorial ANOVA

Repeat this tutorial

Click one of the following:

Return to the list of options in this tutorial

Return to the list of tutorials

Documents

ANOVA_SPSS