SPSS® 12.0 Command Syntax Reference

746 IGRAPH
Syntax Rules
Operations
• EFFECT=THREE and COORDINATE=THREE cannot be specified together. If they are, the
EFFECT keyword will be ignored.
• The chart title, subtitle, and caption are assigned as they are specified on the TITLE,
SUBTITLE, and CAPTION subcommands. In the absence of any of these subcommands, the
missing title, subtitle, or caption are null.
General Syntax
Following are the most general-purpose subcommands. Even so, not all plots will use all subcommands.
For example, if the only element in a chart is a bar, the SIZE subcommand will
not be shown in the graph.
Each general subcommand may be specified only once. If one of these subcommands
appears more than once, the last one is used.
X1, Y, and X2 Subcommands
X1, Y, and X2 assign variables to the X1, Y, and X2 dimensions of the chart.
• The variable must be enclosed in parentheses after the VAR keyword.
• Each of these subcommands can include the TITLE keyword, specifying a string with
which to title the corresponding axis.
• Each variable must be either a scale variable, a categorical variable, or a built-in data
dimension. If a type is not specified, a default type is used from the variable’s definition.
SCALE A scale dimension is interpreted as a measurement on some continuous
scale for each case. Optionally, the minimum (MIN) and
maximum (MAX) scale values can be specified. In the absence of MIN
and MAX, the entire data range is used.
CATEGORICAL A categorical dimension partitions cases into exclusive groups (each
case is a member of exactly one group). The categories are represented
by evenly spaced ticks.
A built-in dimension is a user interface object used to create a chart of counts or percentages
and to make a casewise chart of elements that usually aggregate data like bars or lines. The
built-in dimensions are count ($COUNT), percentage ($PCT), and case ($CASE).
• To create a chart that displays counts or percentages, one of the built-in data dimensions
is assigned to the range (Y) axis. The VAR keyword is not used for built-in dimensions.
• Built in count and percentage data dimensions cannot be assigned to a domain axis (X1
or X2) or to a legend subcommand.
• The count and percentage data dimensions are all scales and cannot be changed into
categorizations.