Any one with an idea of estimating the Technological/Logistic substitution model. The model is specified as: fi(t(j)) = 1/[1-exp(-alpa(t(i))-beta(i)] for t <tb and alpha >0 fi(t(j)) = 1-sum(f(j-1))- sum(f(j+1)) for tb <=t <= tc fi(t(j)) = 1/[1+ exp(alpas(t(i)-betas(i))] for t >=tc and alphas >0. The models assume that n technologies are introduced to the market, where 1 is the oldest and technology n is the newest, i and j are subscripts representing the type of technology, fi is the market share, t is a subscript denoting time, alpha, alphas, beta, and betas are parameters, tb and tc are time periods during which the technology i starts to enter the saturation and decline phase, respectively. Any suggestion, reading is helpful.
Peter Maclean Department of Economics UDSM ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
