[R] nonlinear fitting when both x and y having measurement error?
Bill Simpson
wsi at gcal.ac.uk
Mon Sep 17 10:28:02 CEST 2001
If you post your question on sci.math.num-analysis you might get pointers
to free code (probably fortran). This might be what you want:
http://www.netlib.org/odrpack/
For the linear errors-in-variables problem, you might want to look at:
http://www.pma.caltech.edu/~glenn/glove/glove.html
I think the source code is available.
If you post your question on sci.math.num-analysis you might get pointers
to free code (probably fortran).
They say:
"[Glove gives the] Only correct linear fitting analysis, that we could
find, for data with errors in both variables. "
They don't actually say what algorithm they implement.
I think someone already pointed to a book on nonlinear errors-in-variables
models.
Here are some refs on the linear case.
Press et al Numerical recipes in C. Cambridge Univ Press p.666-670. They
also give code and some refs.
R. Lupton (1993) Statistics in theory and practice. Princeton Univ Press
pp 92-97. He also gives some futher refs.
Bill
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