[R] nonlinear fitting when both x and y having measurement error?

[Bill Simpson]

Here are some programs:

http://astro.u-strasbg.fr/~fmurtagh//mda-sw/
Errors-in-variables regression, 2-dimensional (Fortran) 
      leiv1.f, York (Can. J. Phys. 44, 1079-1086, 1966) 
      leiv2.f, Fasano and Vio 
      leiv3.f, Ripley [R's own BD Ripley!]
All these programs are set up with sample driver routines and sample
data. They should perform exactly the same task. 

Least squares linear and nonlinear parameter estimation with errors in the
predictor variables and the dependent variable:
http://lib.stat.cmu.edu/apstat/286

Bill

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