| p Control
charts are attribute type charts
used to plot units nonconforming when the
samples are not of equal size. This is often
when samples form a natural grouping - for
example the number of treatments in a hospital
in a week.
| Upper
Control Limit |
|
| Lower
Control Limit |
|
Note that the control limits are dynamic,
they depend on the size of the sample.
If the samples sizes are of equal size
an np control
chart can be used. |
