process_tolerance: Calculate QC Process Tolerance
Description
function to calculate a standardized process tolerance with sigma unit
Usage
process_tolerance(LSL, USL, QC.Sigma)
Arguments
LSL
number, customer's lower specification limit.
USL
number, customer's upper specification limit.
QC.Sigma
number, the sigma value determined from an XmR plot or a Studentized (e.g., xBar) analysis.
Value
numeric, standardized process tolerance value in sigma units