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DSCATTER procedure

Produces a scatter-plot matrix using high-resolution graphics (J. Ollerton).

Options

PEN = scalar or variate or factor Pen number for the graph; default 1
EQUALSCALING = string token Whether to have equal scaling of x- and y-axes in each plot (yes, no); default no
XDATA = variates or factors Variables to be plotted as x-coordinates (DATA then specifies the y-coordinates); if unset DATA specifies both x-coordinates and y-coordinates
ASPECTRATIO = scalar Ratio of the length of the y-axis to the length of the x-axis in each plot

Parameter

DATA = variates or factors A list of variables to be plotted

Description

Procedure DSCATTER produces a scatter-plot matrix, from one or two sets of variates or factors, using high-resolution graphics.

The parameter DATA lists the variates or factors to be plotted. In the default display, each one is plotted against all the others, producing plots which are arranged as the lower triangle of a matrix with shared scales. Alternatively, if you set the XDATA to a list of variates or factors, a rectangular grid of plots is produced, displaying each DATA variable against each XDATA variable. Titles for the axes are the identifiers of the variables. The number of variates or factors that can be plotted by this procedure is in effect unlimited, but of course the greater the number of variables, the smaller the individual plots will be.

The pen to be used to plot the data can be specified with the option PEN. The EQUALSCALING option enables you to request that scaling of the x- and y-axes should be equal in each plot. By default the plots are square, but you can request rectangular plots by setting the ASPECTRATIO option to the required value for the length of the y-axis divided by the length of the x-axis.

Options: PEN, EQUALSCALING, XDATA, ASPECTRATIO.
Parameter: DATA.

Action with RESTRICT

If any of the variates or factors is restricted, only the units not excluded by the restriction will be plotted.

See also

Directive: DGRAPH.
Procedures: DMSCATTER, D2GROUPS, TRELLIS.
Commands for: Graphics.

Example

CAPTION 'DSCATTER example'; STYLE=meta
VARIATE [NVALUES=150] PLength,PWidth,SLength,SWidth
READ SLength,SWidth,PLength,PWidth
 5.1  3.5  1.4  0.2
 4.9  3.0  1.4  0.2
 4.7  3.2  1.3  0.2
 4.6  3.1  1.5  0.2
 5.0  3.6  1.4  0.2
 5.4  3.9  1.7  0.4
 4.6  3.4  1.4  0.3
 5.0  3.4  1.5  0.2
 4.4  2.9  1.4  0.2
 4.9  3.1  1.5  0.1
 5.4  3.7  1.5  0.2
 4.8  3.4  1.6  0.2
 4.8  3.0  1.4  0.1
 4.3  3.0  1.1  0.1
 5.8  4.0  1.2  0.2
 5.7  4.4  1.5  0.4
 5.4  3.9  1.3  0.4
 5.1  3.5  1.4  0.3
 5.7  3.8  1.7  0.3
 5.1  3.8  1.5  0.3
 5.4  3.4  1.7  0.2
 5.1  3.7  1.5  0.4
 4.6  3.6  1.0  0.2
 5.1  3.3  1.7  0.5
 4.8  3.4  1.9  0.2
 5.0  3.0  1.6  0.2
 5.0  3.4  1.6  0.4
 5.2  3.5  1.5  0.2
 5.2  3.4  1.4  0.2
 4.7  3.2  1.6  0.2
 4.8  3.1  1.6  0.2
 5.4  3.4  1.5  0.4
 5.2  4.1  1.5  0.1
 5.5  4.2  1.4  0.2
 4.9  3.1  1.5  0.2
 5.0  3.2  1.2  0.2
 5.5  3.5  1.3  0.2
 4.9  3.6  1.4  0.1
 4.4  3.0  1.3  0.2
 5.1  3.4  1.5  0.2
 5.0  3.5  1.3  0.3
 4.5  2.3  1.3  0.3
 4.4  3.2  1.3  0.2
 5.0  3.5  1.6  0.6
 5.1  3.8  1.9  0.4
 4.8  3.0  1.4  0.3
 5.1  3.8  1.6  0.2
 4.6  3.2  1.4  0.2
 5.3  3.7  1.5  0.2
 5.0  3.3  1.4  0.2
 7.0  3.2  4.7  1.4
 6.4  3.2  4.5  1.5
 6.9  3.1  4.9  1.5
 5.5  2.3  4.0  1.3
 6.5  2.8  4.6  1.5
 5.7  2.8  4.5  1.3
 6.3  3.3  4.7  1.6
 4.9  2.4  3.3  1.0
 6.6  2.9  4.6  1.3
 5.2  2.7  3.9  1.4
 5.0  2.0  3.5  1.0
 5.9  3.0  4.2  1.5
 6.0  2.2  4.0  1.0
 6.1  2.9  4.7  1.4
 5.6  2.9  3.6  1.3
 6.7  3.1  4.4  1.4
 5.6  3.0  4.5  1.5
 5.8  2.7  4.1  1.0
 6.2  2.2  4.5  1.5
 5.6  2.5  3.9  1.1
 5.9  3.2  4.8  1.8
 6.1  2.8  4.0  1.3
 6.3  2.5  4.9  1.5
 6.1  2.8  4.7  1.2
 6.4  2.9  4.3  1.3
 6.6  3.0  4.4  1.4
 6.8  2.8  4.8  1.4
 6.7  3.0  5.0  1.7
 6.0  2.9  4.5  1.5
 5.7  2.6  3.5  1.0
 5.5  2.4  3.8  1.1
 5.5  2.4  3.7  1.0
 5.8  2.7  3.9  1.2
 6.0  2.7  5.1  1.6
 5.4  3.0  4.5  1.5
 6.0  3.4  4.5  1.6
 6.7  3.1  4.7  1.5
 6.3  2.3  4.4  1.3
 5.6  3.0  4.1  1.3
 5.5  2.5  4.0  1.3
 5.5  2.6  4.4  1.2
 6.1  3.0  4.6  1.4
 5.8  2.6  4.0  1.2
 5.0  2.3  3.3  1.0
 5.6  2.7  4.2  1.3
 5.7  3.0  4.2  1.2
 5.7  2.9  4.2  1.3
 6.2  2.9  4.3  1.3
 5.1  2.5  3.0  1.1
 5.7  2.8  4.1  1.3
 6.3  3.3  6.0  2.5
 5.8  2.7  5.1  1.9
 7.1  3.0  5.9  2.1
 6.3  2.9  5.6  1.8
 6.5  3.0  5.8  2.2
 7.6  3.0  6.6  2.1
 4.9  2.5  4.5  1.7
 7.3  2.9  6.3  1.8
 6.7  2.5  5.8  1.8
 7.2  3.6  6.1  2.5
 6.5  3.2  5.1  2.0
 6.4  2.7  5.3  1.9
 6.8  3.0  5.5  2.1
 5.7  2.5  5.0  2.0
 5.8  2.8  5.1  2.4
 6.4  3.2  5.3  2.3
 6.5  3.0  5.5  1.8
 7.7  3.8  6.7  2.2
 7.7  2.6  6.9  2.3
 6.0  2.2  5.0  1.5
 6.9  3.2  5.7  2.3
 5.6  2.8  4.9  2.0
 7.7  2.8  6.7  2.0
 6.3  2.7  4.9  1.8
 6.7  3.3  5.7  2.1
 7.2  3.2  6.0  1.8
 6.2  2.8  4.8  1.8
 6.1  3.0  4.9  1.8
 6.4  2.8  5.6  2.1
 7.2  3.0  5.8  1.6
 7.4  2.8  6.1  1.9
 7.9  3.8  6.4  2.0
 6.4  2.8  5.6  2.2
 6.3  2.8  5.1  1.5
 6.1  2.6  5.6  1.4
 7.7  3.0  6.1  2.3
 6.3  3.4  5.6  2.4
 6.4  3.1  5.5  1.8
 6.0  3.0  4.8  1.8
 6.9  3.1  5.4  2.1
 6.7  3.1  5.6  2.4
 6.9  3.1  5.1  2.3
 5.8  2.7  5.1  1.9
 6.8  3.2  5.9  2.3
 6.7  3.3  5.7  2.5
 6.7  3.0  5.2  2.3
 6.3  2.5  5.0  1.9
 6.5  3.0  5.2  2.0
 6.2  3.4  5.4  2.3
 5.9  3.0  5.1  1.8  :
FACTOR    [NVALUES=150; LABELS=!t(Setosa,Versicolor,Virginica);\ 
          VALUES=50(1,2,3)] Species
CALCULATE PLength = (PLength - MEAN(PLength)) / SQRT(VAR(PLength))
&         PWidth = (PWidth - MEAN(PWidth)) / SQRT(VAR(PWidth))
&         SLength = (SLength - MEAN(SLength)) / SQRT(VAR(SLength))
&         SWidth = (SWidth - MEAN(SWidth)) / SQRT(VAR(SWidth))
DSCATTER  [PEN=Species] PLength,PWidth,SLength,SWidth
Updated on February 7, 2023

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