[R] Technological/Logistic substitution model.

Jeff Newmiller jdnewmil at dcn.davis.CA.us
Wed Jul 30 22:32:47 CEST 2014

You are repeating yourself. At least post as a reply to your earlier post.


RSiteSearch("technological logistic")


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Sent from my phone. Please excuse my brevity.

On July 30, 2014 8:54:25 AM PDT, Peter Maclean <pmaclean2011 at yahoo.com> wrote:
> 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 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. T
>The model 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 will be appreciate. 
>Peter Maclean
>Department of Economics
>R-help at r-project.org mailing list
>PLEASE do read the posting guide
>and provide commented, minimal, self-contained, reproducible code.

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