Calculates mean error rate based on Diamond's distance of two variables representing
triangular fuzzy numbers, where one is the response variable and the other is the
prediction from a fuzzy regression model.
Usage
GOF(object, sc = 1e-06)
Value
A numeric.
Arguments
object
a fuzzylm object.
sc
scaling constant used for numerical stability when spreads are equal to zero.
Details
The Diamond's distance of two triangular fuzzy numbers is sum of squared differences
of the core and both support values of the fuzzy numbers.
References
Diamond P. (1988) Fuzzy least squares. Information Sciences
46(3): 141-157.
Wang N., Zhang W.-X., Mei C.-L. (2007) Fuzzy nonparametric regression
based on local linear smoothing technique. Information Sciences
177: 3882-3900.