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MRCHART Statement |

You can use options in the MRCHART statement to

- compute control limits from the data based on a multiple of the standard error of the plotted medians and ranges or as probability limits
- tabulate subgroup sample sizes, subgroup medians, subgroup ranges, control limits, and other information
- save control limits in an output data set
- save subgroup sample sizes, subgroup medians, and subgroup ranges 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 the method for estimating the process standard deviation
- specify a known (standard) process mean and standard deviation for computing control limits
- 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 charts more readable
- display vertical and horizontal reference lines
- control axis values and labels
- control layout and appearance of the chart

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