Representing Derringer-Suich desirability functions
Represents the Derringer-Suich desirability approach.
derFunc(TV, SLs, b)
TV |
numeric specifying the optimal desired value called the target value. |
SLs |
numeric vector of length at most 2 specifying the lower and/or upper specified border. |
b |
numeric vector of length at most 2 specifying the weight(s) for the punishment of deviations from the target value. |
derFunc represents the framework for left, right and two-sided desirability functions
introduced by Derringer and Suich (1980). For all three different kinds of desirability
functions the parameter TV must be specified. If the parameter SLs has
length 1, either the left- or right-sided desirability function is created depending
from whether the value is smaller (left-sided) or greater (right-sided) than the target
value. By specifying SLs as a vector of length 2 a two-sided desirability
function is created where the lower specified border is determined as the smaller value
of SLs and thus the upper specified border is determined as the greater value.
If there are no values specified for the weights, then they are automatically set to 1
(linear loss).
S4 object of class derFunc, a formal representation of desirability
functions introduced by Derringer and Suich.
Derringer, G., and Suich, R., (1980) Simultaneous Optimization of Several Response Variables. Journal of Quality Technology, 12, 214-219.
Other desirability topics:
evaluate(),
getDesScores(),
plotDes(),
plotEv(),
probUnDes()
# create an object of a left-sided desirability function dLeft <- derFunc(0.5, 0.3, 2) # create an object of a right-sided desirability function dRight <- derFunc(0.5, 0.8, 1) # create an object of a two-sided desirability function dLR <- derFunc(0.5, c(0.3, 0.9), c(3, 1))
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