Ppk {ggQC}

Calculate Cpk

Description

function to calculate Cpk - "measure of process centering"

Usage

Ppk(LSL, USL, QC.Center, s.Sigma)

Arguments

LSL

number, customer's lower specification limit.

USL

number, customer's upper specification limit.

QC.Center

number, the mean or median value determined from an XmR plot or a Studentized (e.g., xBar) analysis.

s.Sigma

number, the sigma value determined from overall standard deviation (i.e., sd()).

Value

numeric, Ppk value (unitless)