The SHEWHART Procedure |

Overview |

The UCHART statement creates charts for the numbers of nonconformities (defects) per inspection unit in subgroup samples containing arbitrary numbers of units.

You can use options in the UCHART statement to

specify the number of inspection units per subgroup

compute control limits from the data based on a multiple of the standard error of the plotted values 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 layout and appearance of the chart

You have three alternatives for producing charts with the UCHART statement:

Traditional graphics are produced by default.

ODS Graphics output is produced when you specify the ODS GRAPHICS statement prior to the PROC SHEWHART statement.

Legacy line printer charts are produced when you specify the LINEPRINTER option in the PROC SHEWHART statement.

See Chapter 3, SAS/QC Graphics, for more information about producing these different kinds of graphs.

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