An Iterated Local Search Algorithm for Estimating the Parameters of the Gamma/Gompertz Distribution

Algorithm 2

Proposed hybrid iterated local search.

Obtain a random sample from the distribution the size of which should be big enough.

Initialize the ILS control parameter (𝜆, 𝜀, C, 𝜏₀)

select an initial solution ^⟶𝜃₀=(𝑏,𝛽);

Set   ^⟶𝜃=^⟶𝜃₀

^⟶𝜃^∗ ← Apply Local Search (^→𝜃)

While termination condition not met do

 ^⟶𝜃^′  ← Apply perturbation (^⟶𝜃^∗)

 ^⟶𝜃^′∗    ← Apply Local Search (^⟶𝜃^′)

 ^⟶𝜃^∗  ← Apply acceptance criterion (^⟶𝜃^∗, ^⟶𝜃^′∗)

    Memorize Best Found Solution

End While