367. Cheatsheet
| Index | Formula | Variation Used |
Assumes Process Centering |
Measures |
|---|---|---|---|---|
|
|
Short-term () |
Yes | Pure “noise” under stable conditions (same machine, same operator, same material, no maintenance events) | |
|
|
Short-term () |
No | Pure “noise” under stable conditions (same machine, same operator, same material, no maintenance events) | |
|
|
Long-term () |
Yes | Real-life variability from all causes (data across multiple shifts, operators, material batches, maintenance) | |
|
|
Long-term () |
No | Real-life variability from all causes (data across multiple shifts, operators, material batches, maintenance) | |
|
|
|
No | Penalizes deviation from target (); reflects capability under stable conditions when target matters |
Centered v. Decentered Process