
PARALLEL COORDINATES PLOTName:
In the parallel coordinates plot, a set of parallel axes are drawn for each variable. Then a given row of data is represented by drawing a line that connects the value of that row on each corresponding axis. For example, given the row of data (0, 1, 0) for variables X1, X2, and X3: X3 + X2 + X1 + 0 1The "+" positions identify plot coordinates (these would be drawn as connected lines on a graphics device). Paralled coordinate plots were first recoginized as a data analysis tool by Ed Wegman (see the Reference section below). There have been a number of variants of the parallel coordinate plots recommended in the literature. These are not implemented in the current Dataplot parallel coordinates plot, but may be added at a later date. Syntax 1:
<SUBSET/EXCEPT/FOR qualification> where <y1> through <yk> are the response variables; and where the <SUBSET/EXCEPT/FOR qualification> is optional.
<SUBSET/EXCEPT/FOR qualification> where <y1> through <yk> are the response variables; <tag> is a groupid variable; and where the <SUBSET/EXCEPT/FOR qualification> is optional. With this syntax, the last variable listed is interpreted as a groupid variable. All rows of the response variable with the same groupid are plotted with the same line and character attributes. See the Note section below for additional clarification.
PARALLEL COORDINATES PLOT Y1 TO Y5 PARALLEL COORDINATES PLOT Y1 Y2 Y3 Y4 Y5 SUBSET TAG > 2
where
The default is USCORE. The NONE option is useful if you want to apply your own scaling. For example, you may want to scale the data based on the full data set, but only generate the parallel coordinates plot for a subset of the data.
However you define the original grouping, Dataplot automatically recodes the group id's as the integers from 1 to NG where NG is the number of groups. The coding is from smallest value of the original group id's to the largest value of the original group id's. When the parallel coordinates plot is generated, observations with a group value of 1 use the first settings of the line and character settings, observations with a group value of 2 use the second settings of the line and character settings, and so on.
2003/5: Added GROUP PARALLEL COORDINATE PLOT case and fixed a bug where the presort was not automatically turned off for this command. ROW LIMITS 26 50 COLUMN LIMITS 20 132 READ AUTO79.DAT Y1 TO Y9 . YLIMITS 0 8 MAJOR YTIC MARK NUMBER 9 MINOR YTIC MARK NUMBER 0 Y1TIC MARK LABEL FORMAT ALPHA Y1TIC MARK LABEL CONTENT PRICE MPG 1978SP()REPAIR 1977SP()REPAIR ... HEADSP()ROOM REARSP()SEATCR()ROOM TRUNKSP()SPACE WEIGHT LENGTH YGRID ON TIC OFFSET UNITS SCREEN TIC OFFSET 3 3 . PRESORT OFF FRAME CORNER COORDINATES 20 20 90 90 PARALLEL COORDINATES PLOT Y1 TO Y9
 
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Date created: 5/16/2003 