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CCHART Statement |

You can use options in the CCHART statement to

- specify the number of inspection units per subgroup. Typically (but not necessarily), each subgroup consists of a single unit.
- compute control limits from the data based on a multiple of the standard error of the counts or as probability limits
- tabulate subgroup summary statistics and control limits
- save control limits in an output data set
- save subgroup summary statistics in an output data set
- read preestablished control limits from a data set
- apply tests for special causes (also known as runs tests and Western Electric rules)
- specify a known (standard) value for the average number of nonconformities per inspection unit
- display distinct sets of control limits for data from successive time phases
- add block legends and symbol markers to reveal stratification in process data
- superimpose stars at points to represent related multivariate factors
- clip extreme points to make the chart more readable
- display vertical and horizontal reference lines
- control axis values and labels
- control the layout and appearance of the chart

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