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In-Depth Information
Figure 5.36
Selecting tests for assessing the normality of the distribution.
the other groups have analogous sets of tables in the output. The top
table presents the mean, standard deviation, variance, and 95 percent
confidence intervals. The next two tables present the extreme values in the
distribution. In the middle table, the five highest and five lowest values in
therapy group 1 are listed together with the row number in the data file;
this is default output in
SAS Enterprise Guide
. Because we only have five
cases in the group, the two lists are identical.
The bottom table is the one we requested by selected
Extreme values
in the
Ta b l e s
window and specifying an
n
of 2. SAS has displayed in the
left portion of the table the two lowest values (under
Va l u e
) and their rank
order (under
Order
) and has displayed in the right portion of the table
the two highest values (under
Va l u e
) and their rank order (under
Order
).
The two highest will always be ranked 1 and 2. The ranks of the highest
values will depend on group size; with only five values in the group, the
two highest are ranked 4 and 5.
5.6.4 SAS NORMALITY ANALYSIS
To examine the distribution with respect to normality, once again select
Analyze
Distribution Analysis
.Inthe
Task Roles
window, place
GAF-
score
under
Analysis variables
and
therapy
under
Classification vari-
ables
in the
Summary Statistics Roles
panel. Then click on
Ta b l e s
in the
navigation panel to bring you to the screen shown in Figure 5.36. Check
Tests for normality
and click
Run
.
➜
