MANOVA with SPSS
MANOVA with SPSS
If you instruct SPSS to perform a MANOVA, it automatically arranges your dependent
variables into a canonical variate. The program, then, compares the mean canonical variate
values for each independent variable group. You can include as many independent
variables as you wish in the analysis by entering their names as fixed factors. For a oneway
MANOVA, though, you should identify only one fixed factor, as explained in the following
steps.
1. Choose the "General Linear Model" option in SPSS Analyze pull-down menu.
2. Choose "Multivariate" from the prompts given. A window entitled Multivariate should
appear.
The user performs a MANOVA in SPSS by moving the names of relevant variables from the box on the left side
of the window to the Dependent Variables and Fixed Factor(s) boxes in the center of the window. Because the
MANOVA involves multiple dependent variables, the Dependent Variables box should contain at least two
variable names. The number of variable names moved to the Fixed Factor(s) box depends upon the number of
independent variables involved in the analysis.
3. Identify the variables involved in the analysis.
a. Move the names of dependent variables from the box on the left side of the window
to the box labeled "Dependent Variables."
b. Move the name of the independent variable from the box on the left side of the
window to the box labeled "Fixed Factor(s)."
4. To include descriptive statistics for the groups in the output, click on the window's
"Options" button.
a. Move the name of the independent variable to the box labeled "Display Means for"
box.
b. Mark "Descriptive Statistics" in the "Display" box.
c. Click Continue to return to the Multivariate window.
As with almost all SPSS output, the first table shown simply identifies the categories and
the number of subjects in each one. Of more interest that this information, however, is
likely the "Descriptive Statistics" output table, which appears only if you included Step #4
in the process of requesting the MANOVA. This table contains group means and standard
deviations for each individual dependent variable.
To assess the significance of differences between the mean values, you must evaluate
values in the Multivariate Tests table and, in some cases, the Tests of Between-Subjects
Effects table. The first of these tables contains F and p values for the MANOVA analysis
comparing groups' canonical variate means. The "Tests of Between Subject Effects" table
provides data for ANOVAs performed using each individual dependent variable.
variables into a canonical variate. The program, then, compares the mean canonical variate
values for each independent variable group. You can include as many independent
variables as you wish in the analysis by entering their names as fixed factors. For a oneway
MANOVA, though, you should identify only one fixed factor, as explained in the following
steps.
1. Choose the "General Linear Model" option in SPSS Analyze pull-down menu.
2. Choose "Multivariate" from the prompts given. A window entitled Multivariate should
appear.
The user performs a MANOVA in SPSS by moving the names of relevant variables from the box on the left side
of the window to the Dependent Variables and Fixed Factor(s) boxes in the center of the window. Because the
MANOVA involves multiple dependent variables, the Dependent Variables box should contain at least two
variable names. The number of variable names moved to the Fixed Factor(s) box depends upon the number of
independent variables involved in the analysis.
3. Identify the variables involved in the analysis.
a. Move the names of dependent variables from the box on the left side of the window
to the box labeled "Dependent Variables."
b. Move the name of the independent variable from the box on the left side of the
window to the box labeled "Fixed Factor(s)."
4. To include descriptive statistics for the groups in the output, click on the window's
"Options" button.
a. Move the name of the independent variable to the box labeled "Display Means for"
box.
b. Mark "Descriptive Statistics" in the "Display" box.
c. Click Continue to return to the Multivariate window.
As with almost all SPSS output, the first table shown simply identifies the categories and
the number of subjects in each one. Of more interest that this information, however, is
likely the "Descriptive Statistics" output table, which appears only if you included Step #4
in the process of requesting the MANOVA. This table contains group means and standard
deviations for each individual dependent variable.
To assess the significance of differences between the mean values, you must evaluate
values in the Multivariate Tests table and, in some cases, the Tests of Between-Subjects
Effects table. The first of these tables contains F and p values for the MANOVA analysis
comparing groups' canonical variate means. The "Tests of Between Subject Effects" table
provides data for ANOVAs performed using each individual dependent variable.
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