Table 7 Coefficient estimates

GM

a = − 0.0155, b = 9574.3042

FGM

r = 0.8312, a = 0.0143, b = 8517.5448

GBPM

t = 7, a = − 0.0309, b = 9135.5219, c = − 962.6042

OGBPM

t = 7, a = − 0.0309, b = 9135.5219, c = 65.5797, ε = 0.0119

NOGBPM

t = 7, a = − 0.0305, b = 8993.4245, c = 215.3964, ε = 0.0115, α = 1, β = 0.4561

NGBPM

t = 3, a = − 0.0119, b = 9079.9911, c = 819.7682, α = 1, β = 0.2619

AGBPM

t = 7, a = − 0.0297, b = 9035.6664, ε = 0.0088, α = 0.9881, β = 0.5133