Evolutionary Algorithms: Introduction Jiˇr´ı Kubal´ık Department of ...

pScaling
:: Linear scaling – adjustment of the fitness values distribution in order to get desired selection
pressure
σ = fmax/favg
The actual chromosomes’ fitness is scaled as
Parameters a and b are selected so that
the average fitness is mapped to itself, and
f ′ i = a · fi + b
the best fitness is increased by a desired multiple of the average fitness.
Typical value of σ is from (1.5, 2.0)
Evolutionary Algorithms: Intro