This section provides details on the following topics:

• displaying process data stratified into levels using a symbol-variable

• displaying process data stratified into blocks using block-variables

• displaying process data stratified into time phases using the READPHASES= option

• displaying multiple sets of control limits using the READPHASES= and READINDEXES= options

• displaying multivariate process data using star charts

• displaying trends in process data

• clipping extreme points to create more readable charts

• labeling axes

• selecting subgroups for computation and display

The options described in this section can be specified in all the chart statements available in the SHEWHART procedure.