GCHART Procedure

Example 8: Subgrouping a Donut or Pie Chart

Features:	DONUT statement options DONUTPCT=, LABEL=, LEGEND=, NOHEADING, and SUBGROUP=
Other features:	GOPTIONS statement option BORDER and LEGEND statement
Sample library member:	GCHSBGRP

This example produces a donut chart that is similar to the pie chart in Specifying the Sum Statistic for a Pie Chart. The similarity is that each slice represents total sales for a site and each slice is a different color. However, in this donut chart the sites are subgrouped by department, so that each department is represented as a concentric ring with slices.

Subgrouping suppresses the chart statistic and the midpoint labels. Instead, it automatically labels the rings with the subgroup values and generates a legend that shows how the patterns are associated with the midpoint values. Subgrouping a pie chart produces the same results but without the hole in the center.

To make the donut chart as large as possible, the program suppresses the default heading and moves the legend into the space at the left of the chart.

Program

goptions reset=all border;

data totals;
length dept $ 7 site $ 8;
input dept site quarter sales;
datalines;
Parts Sydney 1 7043.97
Parts Atlanta 1 8225.26
Parts Paris 1 5543.97
Tools Sydney 4 1775.74
Tools Atlanta 4 3424.19
Tools Paris 4 6914.25
;

title "Sales by Site and Department";

legend1 label=none
position=(middle left)
offset=(5,)
across=1;

proc gchart data=totals;
format sales dollar8.;
donut site / sumvar=sales
subgroup=dept
donutpct=30
label=("All" justify=center "Quarters")
noheading
legend=legend1;
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 data set TOTALS. TOTALS contains quarterly sales data for three manufacturing sites for one year. Sales figures are broken down by department.

data totals;
length dept $ 7 site $ 8;
input dept site quarter sales;
datalines;
Parts Sydney 1 7043.97
Parts Atlanta 1 8225.26
Parts Paris 1 5543.97
Tools Sydney 4 1775.74
Tools Atlanta 4 3424.19
Tools Paris 4 6914.25
;

Define title.

title "Sales by Site and Department";

Modify the subgroup legend. The LABEL= option suppresses the legend label. The POSITION=, the OFFSET=, and the ACROSS= options arrange the legend entries in a column to the left of the pie chart.

legend1 label=none
position=(middle left)
offset=(5,)
across=1;

Produce the donut chart. The SUBGROUP= option divides the donut into rings. Each ring represents a value of the subgroup variable, DEPT. The DONUTPCT= option controls the size of the donut hole, which contains the text specified by the LABEL= option. The NOHEADING option suppresses the default heading that contains the name of the chart variable and the type of statistic. The LEGEND= option assigns the LEGEND1 statement to the chart.

proc gchart data=totals;
format sales dollar8.;
donut site / sumvar=sales
subgroup=dept
donutpct=30
label=("All" justify=center "Quarters")
noheading
legend=legend1;
run;
quit;