Parallel plots represent a set of points by plotting one line per observation with the value of each variable for that observation indicated by the horizontal location at which the line crosses the reference line for that variable.
To generate a parallel plot
Choose Graph Multiple Variables
Parallel Plot. The dialog shown below appears.
Data page
In the Parallel Plot dialog, the Data page has the following options:
Data
Data Set
Select a data set from the dropdown list or type the name of a data set. You can also type into the Data Set edit field any expression that evaluates to a data set.
Enter an S-PLUS expression that identifies the rows to use in the analysis. To use all the rows in the data set, leave this field blank.
Variables
Value
Specify the column of values to use in the density.
Conditioning
Select the columns specifying conditioning values.
Save Graph Object
Enter the name for the object in which to save the results of the analysis.
Titles page
In the Parallel Plot dialog, the Titles page has the following options:
Titles
Main Title
Specify a main title to add on the top of the page.
Subtitle
Specify a subtitle to add on the bottom of the page.
Labels
X Axis Label
Specify a label for the x-axis.
Y Axis Label
Specify a label for the y-axis.
Multipanel page
In the Parallel Plot dialog, the Multipanel page has the following options:
Layout
Number of Columns/Rows/Pages Control the layout of the panels by specifying the number of columns, rows and pages.
Panel Order Choose from Graph Order or Table Order. Graph Order begins drawing panels in the bottom left corner of the graph, to the right and up. Table Order begins drawing panels in the upper left corner and continues right.
Include Strip Labels Check this to include strip labels on panels.
Continuous Conditioning
Number of Panels If the data are continuous, the number of panels is determined by the number specified in this field.
Overlap Fraction Create overlapping intervals by specifying the fraction of data points that are shared across two panels.
Interval Type Choose from Equal Counts or Equal Ranges. Equal Counts places an equal number of data points in each plot. Equal Ranges makes the interval widths all equal.