York University

If a classification variable is specified with the GROUP= parameter, the value of that variable determines the shape and color of the plotting symbol. The macro GENSYM defines the SYMBOL statements for the different groups, which are assigned according to the sorted value of the grouping variable. The default values for the SYMBOLS= and COLORS= parameters allow for up to eight different plotting symbols and colors. If no GROUP= variable is specified, all observations are plotted using the first symbol and color.

Macro | Function | Needed |
---|---|---|

%gdispla | device-independent DISPLAY control | always |

%lowess | smoothed lowess curves | ANNO = ... LOWESS |

%ellipses | data ellipses | ANNO = ... ELLIPSE |

%boxaxis | boxplot for diagonal panels | ANNO = ... BOX |

- DATA=_LAST_
- Name of the data set to be plotted.
- VAR=
- List of variables to be plotted. The VAR= variables may be specified as a list of blank-separated names, or as a range of variables in the form X1-X4 or VARA--VARB.
- GROUP=
- Name of an optional grouping variable used to define the plot symbols and colors.
- INTERP=NONE
- SYMBOL statement interpolation option. Specifying INTERP=RL gives a fitted linear regression line in each scatterplot.
- ANNO=NONE
- Provides additional annotations to the diagonal
and/or off-diagonal panels of the scatterplot matrix.
You can specify one or more of the keywords BOX, ELLIPSE,
and LOWESS
- BOX - draws a boxplot showing the distribution of each variable
in the diagonal panel for that variable.
Requires the
`boxaxis`macro - ELLIPSE - draws a data ellipse
in each off-diagonal panel.
Requires the
`ellipses`macro - LOWESS - draws a smoothed lowess curve
in each off-diagonal panel.
Requires the
`lowess`macro

- BOX - draws a boxplot showing the distribution of each variable
in the diagonal panel for that variable.
Requires the
- SYMBOLS=%str(circle + : $ = X _ Y)
- List of symbols, separated by spaces, to
use for plotting points in each of the groups.
The
*i*-th element of SYMBOLS is used for group*i*. If there are more groups than symbols, the available values are reused cyclically. - COLORS=BLACK RED GREEN BLUE BROWN YELLOW ORANGE PURPLE
- List of colors to use for each of the
groups. If there are
*g*groups, specify*g*colors. The*i*-th element of COLORS is used for group*i*. If there are more groups than colors, the available values are reused cyclically. - NAME=scatmat
- Name of the graphic catalog entry
- GOUT=GSEG
- Name of the graphics catalog used to store the final scatterplot matrix constructed by PROC GREPLAY. The individual plots are stored in WORK.GSEG.

%include macros(scatmat); data test; do i=1 to 60; gp = 1 + mod(i,3); x1 = round( 100*uniform(12315)); x2 = round( 100*uniform(12315)) + x1 - 50; x3 = round( 100*uniform(12315)) - x1 + x2; x4 = round( 100*uniform(12315)) + x1 - x3; output; end; %scatmat(data=test, var=x1-x3, group=gp, interp=rl);

Show the same data with marginal boxplots, and data ellipses:

%scatmat(data=test, var=x1-x3, group=gp, interp=rl, anno=BOX ELLIPSE);