Visualizing Categorical Data: catplot

The catplot macro ( get catplot.sas)

Plots for logit models fit by PROC CATMOD

The horizontal variable may be character (XC=) or numeric (X=). A separate curve is drawn for each value of the CLASS= variable, connecting predicted values, with optional standard error bars, and separate plots are drawn for each value of the BYVAR= variable.

Usage

The catplot macro is called with keyword parameters. The arguments may be listed within parentheses in any order, separated by commas. For example:

 proc catmod;
        direct husinc;
        response / out=logits;
        model labour = husinc children; 
 %catplot(data=logits, x=husinc, y=_pred_, class=labor, byvar=children);

DATA=

The name of the SAS dataset to be plotted, which must be an output data set from PROC CATMOD. If DATA= is not specified, the most recently created data set is used.

X=

Name of a numeric factor variable to be used as the horizontal variable in plots. Use the XC= parameter to specify a character variable. You must specify either the X= or XC= variable.

XC=

Name of a character factor variable used as the horizontal variable in plots.

Y=

Name of the ordinate variable. Y=_PRED_ plots the predicted value; Y=_OBS_ plots the observed value.

CLASS=

The name of a factor variable, used to define separate curves which are plotted for each level of this variable.

BYVAR=

Name of one or more factor variables to be used to define multiple panels in plots.

BYFMT=

Name of a SAS format used to format the value of BYVARs for display in one panel of the plot(s).

TYPE=

The type of oobservations to be plotted. TYPE=FUNCTION (the default) gives plots of the logit value; TYPE=PROB gives plots of the probability value.

Z=

Standard error multiple for confidence intervals around predicted values, e.g., Z=1.96 gives 95% CI. To suppress error bars, use Z=0. The default is Z=1, giving 67% CI.

CLFMT=

Name of a SAS format used to format the value the CLASS= variable for display in each panel of the plot(s).

CLSIDE=

Specifies whether the values of the CLASS= variable should be labelled by annotation in the plot or by a legend. If CLSIDE=LEFT or CLSIDE=FIRST, CLASS= values are written at the left side of each curve. If CLSIDE=RIGHT or CLSIDE=LAST, CLASS= values are written at the right side of each curve. If CLSIDE=NONE, CLASS= values appear in the legend.

XFMT=

Name of a SAS format used to format the values of the horizontal variable.

ANNO=

Name of an additional input annotate data set

SYMBOLS=

List of SAS/GRAPH symbols for the levels of the CLASS= variable. There should be as many symbols as there are distinct values of the CLASS=variable.

COLORS=

List of SAS/GRAPH colors for the levels of the CLASS= variable. There should be as many colors as there are distinct values of the CLASS= variable.

LINES=

List of SAS/GRAPH line styles for the levels of the CLASS= variable. There should be as many lines as there are distinct values of the CLASS= variable.

HAXIS=

Axis statement for custom horizontal axis, e.g., HAXIS=AXIS2

VAXIS=

Axis statement for custom response axis, e.g., VAXIS=AXIS1. If no axis statement is defined, the program uses AXIS1 LABEL=(a=90).

LEGEND=

Legend statement for custom CLASS legend, e.g., LEGEND=LEGEND1

Example

See also