Combining Diffusion and Grey Models Based on Evolutionary Optimization Algorithms to Forecast Motherboard Shipments

Table 3

Parameter values of all methods.

Year	Method	Parameters
1998–2009	Bass diffusion model with GA	𝑚=1512404;𝑝=0.0321;𝑞=0.2255
1998–2002		𝑎=−0.0776;𝑏=63299.8
1999–2003		𝑎=−0.0748;𝑏=71247.8
2000–2004		𝑎=−0.1042;𝑏=67427.2
2001–2005	RGM(1,1)	𝑎=−0.0806;𝑏=80632.2
2002–2006		𝑎=−0.0255;𝑏=101302.4
2003–2007		𝑎=−0.0010;𝑏=110072.1
2004–2008		𝑎=0.0473;𝑏=123165.0
2005–2009		𝑎=0.0902;𝑏=129711.4
2003–2009	Combined model with GA	𝑚=1483972;𝑝=0.0311;𝑞=0.2369
2003–2009	Combined model with PSO	𝑚=1419290;𝑝=0.0288;𝑞=0.2594
2003–2009	Combined model with hybrid	𝑚=1420173;𝑝=0.0289;𝑞=0.2589