Advances in Operations Research

Research Article

A Hybrid Genetic Programming Method in Optimization and Forecasting: A Case Study of the Broadband Penetration in OECD Countries

Table 25

Representation of the first five produced hGP models in fitting (The Netherlands).
Fitting performance—hGP models for The Netherlands
Model nameModel
hGP Model 10.00328297044203*E(−((−1.62805354054−1.51126326886*E(−0.308998348091
*E(0.00681524096293*t))*E(−32.6517776745*E(−2.63952059485−0.0444857287095*t))*E
(E(−0.00300820120766*t))*E(E(−6.16053667129*E(−7.75605043494*E(−1.862862714
−195.916190767*E(−250.192549588*E(−0.0440511725397*t)) −1.01338834582)))))))
hGP Model 20.00272274693312*E(−((−1.4875958793−4.39774477765*E(+1.48779357596e−06*E
(+0.0712548718888*t))*E(−25.1750484592*E(−2.51499099805−0.0357061452836*t))*E
(E(−0.00188093694928*t))*E(E(−59.713187786*E(−697.16935125*120.774228698*E
(−0.127948050362*t))*E(−0.0885251390425*t))−2.0188443226))))
hGP Model 30.00279956582383*E(−((−1.87785817855−0.691671611195*E(−0.937233488237*E
(−0.0154741062254*t))*E(−29.8530474333*E(−2.62003795345−0.0517069348527*t))*E(E
(−0.0036068106375*t))*E(E(−20.7938314693*E(−104.667728363*E(30.4510810431
−64.4593053792*E(−3388.8924389*E(−0.174118745631*t))+31.2957260778)))))))
hGP Model 40.00279956582383*E(−((−1.87785817855−0.691671611195*E(−0.937233488237*E
(−0.0154741062254*t))*E(−29.8530474333*E(−2.62003795345−0.0517069348527*t))*E
(E(−0.0036068106375*t))*E(E(−20.7938314693*E(−104.667728363*E(+30.4510810431
−64.4593053792*E(−3388.8924389*E(−0.174118745631*t))+31.2957260778)))))))
hGP Model 50.0056229772664*(((E(E(−567628.398566*t))*E(E(−5.98069338075*E(−0.246097777946*t)
)*E(0.00111530764774*t))+E(E(0.000864502471227*t))*E(E(−18544.326574*E
(−0.147581997545*t))*E(−0.0398044163448*t))*E(E(−2.07368114239*E(t))+E
((−3.39589351006*E(−0.0540701741002*t))+1.12064956451)))))