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BOXCHART Statement |

You can use options in the BOXCHART statement to

- specify control limits for subgroup means or medians
- compute control limits from the data based on a multiple of the standard error of the means (or medians) 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 one of several methods for estimating the process standard deviation
- specify whether subgroup standard deviations or subgroup ranges are used to estimate the process standard deviation
- specify a known (standard) process mean and standard deviation for computing control limits
- create a secondary chart that displays a time trend removed from the data (see "Displaying Trends in Process Data" )
- specify one of several methods for calculating quantile statistics (percentiles)
- control the style of the box-and-whisker plots
- display distinct sets of control limits for data from successive time phases
- add block legends and symbol markers to reveal stratification in process data
- clip extreme points to make the chart more readable
- display vertical and horizontal reference lines
- control axis values and labels
- control layout and appearance of the chart

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