Calculate Summary of Quality Performance Parameters
function to report listing of quality performance parameters
Proc. Tolerance (sigma): Describes the number of your process sigma (from QC charting) that can fit in your customer's specification window (the larger the better).
DNS (sigma): Distance to Nearest Specification (DNS) limit. Measure of how centered your process is and how close you are to the nearest process limit in sigma units.
Cp: Describes how many times your 6 sigma process window (from QC charting) can fit in your customer's specification window (the larger the better)
Cpk: Describes how centered your process is relative to customer specifications. How many times can you fit a 3 sigma window (from QC charting) between your process center and the nearest customer specification limit.
Pp: Describes how many times your 6 sigma process window (overall standard deviation) can fit in your customer's specification window (the larger the better)
Ppk: Describes how centered your process is relative to customer specifications. How many times can you fit a 3 sigma window (overall standard deviation) between your process center and the nearest customer specification limit.
capability.summary(LSL, USL, QC.Center, QC.Sigma, s.Sigma, digits = 2)
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. |
s.Sigma |
number, the sigma value determined from overall standard deviation (i.e., sd()). |
digits |
integer, how many digits to report. |
data frame , listing of metric labels and value
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