Displaying 2 results from an estimated 2 matches for "motulsky".
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metelsky
2009 Oct 12
0
Non linear fitting of 2 distributions with shared parameters
...tings of 2 different experimental
distributions. I use nls() to the fit the 2 distribution and it works
pretty well.
The statistical comparison of 2 non linear fits is well described in
the book "Fitting Models to Biological Data using Linear and Nonlinear
Regression" from Harvey Motulsky and Arthur Christopoulos.
This test is based on the calculation of an F-value that compares the
residuals of
1°) the global fit of both data sets (with one value for each
parameter) on one hand,
2°) with the 2 fits of each separate data sets (with thus 2 values for
each parameter) on the othe...
2006 Aug 15
2
nls convergence problem
I'm having problems getting nls to agree that convergence has occurred in a
toy problem.
nls.out never gets defined when there is an error in nls. Reaching the
maximum number of iterations is alway an error, so nls.out never gets
defined when the maximum number of iterations is reched.
>From ?nls.control:
tol: A positive numeric value specifying the tolerance level for
the