User Guide

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Chapter 40
or counts. The normal curve display option and bin options are available only for
population pyramids showing the distribution of a scale variable. The plot shape
display opt
ion is available only for dot plots.
Missing Values
If you selec
ted summaries of separate variables for a categorical chart or if you are
creating a scatterplot, you can choose one of the following alternatives for exclusion
of cases having missing values:
 Exclude cases listwise. If any of the variables in the chart has a missing value for
a given case, the whole case is excluded from the chart.
 Exclude cases variable by variable. If a selected variable has any missing values,
the cases h
aving those missing values are excluded when the variable is analyzed.
To see the d
ifference between listwise and variable-by-variable exclusion of missing
values, consider the following figures, which show a bar chart for each of the two
options.
Figure 40-9
Listwise exclusion of missing values