The quality loss function is one of the tools of the Six
Sigma methodology. The function assigns a cost to an
observed value, that is larger as far as it is from the
target.
Usage
ss.lf(lfa.Y1, lfa.Delta, lfa.Y0, lfa.L0)
Arguments
lfa.Y1
The observed value of the CTQ (critical to
quality) characteristic that will be evaluated.
lfa.Delta
The tolerance for the CTQ.
lfa.Y0
The target for the CTQ.
lfa.L0
The cost of poor quality when the
characteristic is $Y_0 + \Delta$.
Value
ss.lfA number with the evaluated function at
$Y_1$
References
Taguchi G, Chowdhury S,Wu Y (2005) Taguchi's
quality engineering handbook. John Wiley
Cano, Emilio L., Moguerza, Javier M. and Redchuk, Andres.
2012. Six Sigma with {R}. Statistical Engineering
for Process Improvement, Use R!, vol. 36. Springer, New
York.
http://www.springer.com/statistics/book/978-1-4614-3651-5.