User Guide

392
Chapter 22
Display. Select Descriptive statistics to produce observed means, standard deviations,
and counts for all of the dependent variables in all cells. Estimates of effect size gives a
partial eta
-squared value for each effect and each parameter estimate. The eta-squared
statistic describes the proportion of total variability attributable to a factor. Select
Observed power to obtain the power of the test when the alternative hypothesis is set
basedonth
e observed value. Select
Parameter estimates to produce the parameter
estimates, standard errors, t tests, confidence intervals, and the observed power for
each test. Select Contrast coefficient matrix to obtain the L matrix.
Homogenei
ty tests
produces the Levene test of the homogeneity of variance for
each dependent variable across all level combinations of the between-subjects factors,
for between-subjects factors only. The spread-versus-level and residual plots options
are usefu
l for checking assumptions about the data. This item is disabled if there are
no factors. Select
Residual plot to produce an observed-by-predicted-by-standardized
residual plot for each dependent variable. These plots are useful for investigating the
assumpt
ion of equal variance. Select
Lack of fit to check if the relationship between
the dependent variable and the independent variables can be adequately described by
the model. General estimable function allows you to construct custom hypothesis tests
based on
the general estimable function. Rows in any contrast coefficient matrix are
linear combinations of the general estimable function.
Significance level. You might want to adjust the significance level used in post
hoc tes
ts and the confidence level used for constructing confidence intervals. The
specified value is also used to calculate the observed power for the test. When
you specify a significance level, the associated level of the confidence intervals
is disp
layed in the dialog box.
UNIANOVA Command Additional Features
The SPSS command language also allows you to:
 Specify nested effects in the design (using the DESIGN subcommand).
 Specify tests of effects versus a linear combination of effects or a value (using the
TEST subcommand).
 Specify multiple contrasts (using the CONTRAST subcommand).
 Include user-missing values (using the MISSING subcommand).
 Specify EPS criteria (using the CRITERIA subcommand).