Not a direct answer to your questions, but for error-in-variables
problems, there are newer technologies than what is in NR. For example:
install.packages("simex")
library(simex)
example(simex)
Andy
From: Marc Fischer
>
> Dear Folks,
>
> We need to fit the model y~x assuming there are random
> errors in both
> x and y. Numerical Recipes (Press et al.) have two useful
> functions,
> fitxy and fitexy, which handle cases of unspecified and specified
> errors respectively.
>
> Are there equivalent functions in base R or a installable package?
> Alternatively, has anyone written a wrapper to provide an
> interface to
> a library of Numerical Recipes routines constructed for Linux?
>
> Kind regards,
>
> Marc
>
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