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SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

SPSS® 12.0 Command Syntax Reference

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172 CASEPLOT<br />

Options<br />

Modifying the Variables. You can request a natural log transformation of the variable using the<br />

LN subcommand and seasonal and nonseasonal differencing to any degree using the SDIFF<br />

and DIFF subcommands. With seasonal differencing, you can also specify the periodicity on<br />

the PERIOD subcommand.<br />

Plot Format. With the FORMAT subcommand, you can fill in the area on one side of the plotted<br />

values on plots with one variable. You can also plot a reference line indicating the variable<br />

mean. For plots with two or more variables, you can specify whether you want to join the<br />

values for each case with a horizontal line. With the ID subcommand, you can label the vertical<br />

axis with the values of a specified variable. You can mark the onset of an intervention<br />

variable on the plot with the MARK subcommand.<br />

Split-File Processing. You can control how to plot data that have been divided into subgroups<br />

by a SPLIT FILE command using the SPLIT subcommand.<br />

Basic Specification<br />

The basic specification is one or more variable names.<br />

• If the DATE command has been specified, the vertical axis is labeled with the DATE_ variable<br />

at periodic intervals. Otherwise, sequence numbers are used. The horizontal axis is<br />

labeled with the value scale determined by the plotted variables.<br />

Figure 1 shows a default high-resolution plot with DATE=YEAR 1900. Figure 2 shows the<br />

same default plot in low resolution.<br />

Figure 1 CASEPLOT=PRICE (in high resolution)

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