Overview
The NPCHART statement creates np charts for
the numbers of nonconforming (defective)
items in subgroup samples.
You can use options in the NPCHART statement to
- compute control limits from the data based on a multiple of
the standard error of the numbers of nonconforming items or
as probability limits
- tabulate subgroup sample sizes,
numbers of nonconforming items,
control limits, and other information
- save control limits in an output data set
- save subgroup sample sizes and proportions of
nonconforming items 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)
proportion of nonconforming items for computing
control limits
- specify the data as counts, proportions, or
percentages of nonconforming items
- 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.
