a dataset from SAS's online document.
/* Set the graphics environment */ goptions reset=all; /* Create the input data set SALES */ data sales; input site $ 1-8 count; datalines; Atlanta 103 Chicago 486 Dallas 195 Denver 400 New York 307 Seattle 577 ; run; /* Produce the chart */ proc gchart data=sales; pie site / sumvar=count slice = inside value = none noheading; run;
My intuition is that the pie above has bumps on the boundary areas. In SAS, the SVG-based SG procedures can be a rescue. However, right now they don't include an option of the PIE chart (because a pie chart is not a statistical graph?)
An alternative solution
In this example, I switch to a plug-in of D3 to draw the pie again. This time I finally obtain a really round pie.