GCHART Procedure

Example 12: Charting a Discrete Numeric Variable in a Star Chart

Features:	STAR statement options DISCRETE, FILL=, NOCONNECT, NOHEADING, and SUMVAR=
Other features:	GOPTIONS statement option BORDER
Sample library member:	GCHDSCRT

This example produces two star charts that show the total number of parts that were rejected each month for a year. The STAR statement uses the DISCRETE option so that each unique value of the numeric variable DATE is a separate midpoint and has a separate spine. Each slice displays the formatted midpoint value and the chart statistic. Specifying FILL=S rotates the solid pattern through all the colors in the style's list of colors as many times as necessary to provide patterns for all the slices.

The second chart uses the NOCONNECT option so that the chart uses spines instead of slices.

GCHDSCRT-Charting a discrete numeric variable in a star chart

Star chart using spines instead of slices

Program

goptions reset=all border;

data rejects;
informat date date9.;
input site $ date badparts;
datalines;
Sydney 01JAN1997 8
Sydney 01FEB1997 11
Sydney 28JUN1997 13
Sydney 31OCT1997 6
Paris 11APR1997 12
Paris 04MAY1997 12
Paris 30AUG1997 14
Paris 01DEC1997 7
Atlanta 15MAR1997 7
Atlanta 18JUL1997 12
Atlanta 03SEP1997 10
Atlanta 12NOV1997 9
;

title "Rejected Parts";

proc gchart data=rejects;
format date worddate3.;
star date / discrete
sumvar=badparts
noheading
fill=s;
run;

star date / discrete
sumvar=badparts
noheading
noconnect;
run;
quit;

Program Description

Set the graphics environment. The BORDER option in the GOPTIONS statement draws a black border around the graph.

goptions reset=all border;

Create the data set REJECTS. REJECTS contains data on the number of defective parts produced at each of three sites for 12 months. BADPARTS is the number of parts that were rejected at each site for each month.

data rejects;
informat date date9.;
input site $ date badparts;
datalines;
Sydney 01JAN1997 8
Sydney 01FEB1997 11
Sydney 28JUN1997 13
Sydney 31OCT1997 6
Paris 11APR1997 12
Paris 04MAY1997 12
Paris 30AUG1997 14
Paris 01DEC1997 7
Atlanta 15MAR1997 7
Atlanta 18JUL1997 12
Atlanta 03SEP1997 10
Atlanta 12NOV1997 9
;

Define title.

title "Rejected Parts";

Produce the first star chart. The DISCRETE option must be specified because the numeric chart variable, DATE is assigned the WORDDATE3. Using FILL=S fills all the slices with solid patterns. The embedded RUN statement is required to end this first RUN-Group and honor the action statement and other SAS statements. It signals that the procedure will remain active.

proc gchart data=rejects;
format date worddate3.;
star date / discrete
sumvar=badparts
noheading
fill=s;
run;

Produce the second star chart with slices and a solid fill. The NOHEADING option suppresses the default heading for the star chart. The NOCONNECT option suppresses the lines that by default join the ends of the spines.

star date / discrete
sumvar=badparts
noheading
noconnect;
run;
quit;