User Guide

360
Chapter 20
Optionally, you can click Options to control the treatment of missing data and the
level of the confidence interval.
Independent-Samples T Test Define Groups
Figure 20-3
Define Grou
ps dialog box for numeric variables
For numeric grouping variables, define the two groups for the t test by specifying two
values or a cut point:
 Use specified values. Enter a value for Group 1 and another for Group 2. Cases
with any other values are excluded from the analysis. Numbers need not be
integers (for example, 6.25 and 12.5 are valid).
 Cut point. Alternatively, enter a number that splits the values of the grouping
variable into two sets. All cases with values less than the cut point form one
group, and cases with values greater than or equal to the cut point form the
other group.
Figure 20-4
Define Groups dialog box for string variables
For short string grouping variables, enter a string for Group 1 and another for Group
2, such as yes and no. Cases with other strings are excluded from the analysis.