LD {ggQC}

Calculate Distance to Lower Specification Limit

Description

function to calculate a standardized distance to the Lower specification limit (sigma units)

Usage

LD(LSL, USL, QC.Center, QC.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.

QC.Sigma

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

Value

numeric, standardized distance to the lower specification limit (sigma units)