### Capability Indexes: Table of Calculations

Calculations of capability indexes vary based on the control chart selected and the subgroup size:

If the subgroup's size is greater than 1:
| XBar & R | X Tilde & R | XBar & S
| * | * | *

* If there is no lower tolerance, then

If the subgroup's size is 1:
| RX | XMR(2) | XMR(3)
| * | * | *

* If there is no lower tolerance, then .

See also:

Calculation of Capability Based on Normal Distribution Parameters

Estimates of Standard Deviation Based on Control Charts