Combining Diffusion Models and Macroeconomic Indicators with a Modified Genetic Programming Method: Implementation in Forecasting the Number of Mobile Telecommunications Subscribers in OECD Countries

Table 16

Models’ expression and statistical indices of two modified-hGP models in forecasting the total number of OECD subscribers.

Modified-hGP models in forecasting the total number of OECD mobile subscribers
Model name	Model’s expression	MAPE	wSSE	BIC
First modified-hGP model	(0.775676467651/(1+Exp(437.848202929−0.578442691486∗(𝑡−(−749.533938063)))))+(4.22932908617/(1+(−48176.7645458/(−48176.7645458−1307360612.91))^𝑡+(3.8401940855𝑒−06/(3.8401940855𝑒−06−1.24868528122𝑒−06))^𝑡+(3.8401940855𝑒−06+Exp(437.848202929−0.578442691486∗(𝑡−(−749.533938063)))))+(4.22932908617/(1+(−48176.7645458/(−GDPpC)/(−42.31487519/1∗GDPpC)/(−102.941426203∗𝑡−2−1∗((598.328254158∗Exp(−CPI∗𝑡/((CPI))))))))))	0.004733	9.02𝐸−05	−9.31366
Second modified-hGP model	(−10.4403884897/1∗GDPpC)/(0.100668160215∗𝑡−2−2−1∗((179388.4533∗Exp(−CPI∗13.8576512968))))	0.021657	0.000433	−9.32401