See SHWSTR2 in the SAS/QC Sample LibraryThe following statements create star charts for paint index using different styles for the stars specified with the STARTYPE= option:

symbol v = none;
title 'Variables Related to Paint Index';
proc shewhart history=paint limits=paintlim;
   xchart pindex * hour /
      nolegend
      starvertices = ( thick gloss defects dust humid temp )
      starstart    = '1:00'T
      startype     = wedge;
   xchart pindex * hour /
      nolegend
      starvertices = ( thick gloss defects dust humid temp )
      starstart    = '1:00'T
      startype     = radial;
   xchart pindex * hour /
      nolegend
      starvertices = ( thick gloss defects dust humid temp )
      starstart    = '1:00'T
      startype     = spoke;
   xchart pindex * hour /
      nolegend
      starvertices = ( thick gloss defects dust humid temp )
      starstart    = '1:00'T
      startype     = corona;
run;

The charts are shown in Figure 17.159, Figure 17.160, Figure 17.161, and Figure 17.162. The default style for the stars is STARTYPE=POLYGON, which is illustrated in Figure 17.157 and Figure 17.158. For more information, see the entry for the STARTYPE= option in Dictionary of Options: SHEWHART Procedure.