Information Technology Reference
In-Depth Information
Figure 13.27
Specifying the effects for which we wish to obtain least square means.
Select
Least Squares Post Hoc Tests
in the navigation panel. Click the
Add
pushbutton at the bottom of the
Effects to estimate
pane. The screen
shown in Figure 13.27 appears. Highlight each of the three effects in turn
under the
Effects to use
menu and select
True
for each; this command
will cause the means for each of the effects to be output. Click the
Run
pushbutton.
13.10 SAS OUTPUT OF THE OMNIBUS ANALYSIS
The least squares means are shown in Figure 13.28. The results of the
omnibus analysis are shown in Figure 13.29. These
F
ratios are the same
as those produced by SPSS. As can be seen, all of the effects are statistically
significant.
13.11 PERFORMING THE SIMPLE EFFECTS ANALYSIS IN SAS
To perform the simple effects analysis in
SAS Enterprise Guide
, configure
the analysis as shown above. Then in the
Least Squares Post Hoc Tests
screen shown in Figure 13.30, in the
Effects to use
frame, set the two-way
interaction to
True
and all others to
False
. Then in the
Comparisons
frame, set
Show p-values for differences
to
All pairwise differences
and
set
Adjustment method for comparison
to
Bonferroni
.Click
Run
to
perform the analysis.
