Statistical Process Control (SPC)
x moving R Chart (with 2 stages - before & after)
x moving R Chart (with 2 stages - before & after)
Allows you to see whether the process has changed after an intervention or is changing on its own.
We can also see whether the process variation has increased or reduced.
x-bar R Chart
x-bar R Chart
The process behaviour between time intervals and within the subgroup may be recognised.