Overview
The IRCHART statement creates control charts for
individual measurements and moving ranges.
These charts are appropriate when only one measurement is available
for each subgroup sample and when the measurements are
independently and normally distributed.
You can use options in the IRCHART statement to
- compute control limits from the data based on a multiple of
the standard error of the individual measurements and moving
ranges or as probability limits
- tabulate individual measurements, moving ranges, and
control limits
- save control limits in an output data set
- save individual measurements and moving 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 a known (standard) process mean and standard deviation
for computing control limits
- specify the number of consecutive measurements to use
when computing the moving ranges
- 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 layout and appearance of the chart
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
