[R-sig-Geo] double stochastic weights matrix

[Roger Bivand]

On Tue, 27 Oct 2009, Carson Farmer wrote:

> Hi list,
>
> Does anyone know of a package/function that will compute double 
> stochastic matrices? In case my terminology is wrong: What I am looking 
> for is a function to take an input (weights) matrix, and output a new 
> matrix with row and column sums equal to some specified value (or as 
> close to this as possible given some maximum number of iterations or 
> other parameter). This would likely be an iterative function, with some 
> sort of balancing term to avoid drift. Does anyone know of an 
> implementation of this? Perhaps I should pose this question to the 
> general R mailing list?

Google on Biproportional or Biproportionate matrices - refered to in 
Haggett, Cliff & Frey (1977), p. 125, originally Bacharach (1970). There 
are papers on algorithms, mostly related to input-output modelling, 
including RAS updating.

Roger

>
> Cheers,
>
> Carson
>
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no