Is there a library that provides power calculation and sample size
estimation for nonlinear regression?
The task is easy for linear regression with the pwr package, but I
can't find a method for nonlinear regression (estimated with the nls
package).
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May I suggest you consult your local statistician. For reasons that (s)he
can answer, your request makes little sense.
Hint: Nonlinear regression is much different than linear regression: The
design matrix -- and hence the variance of estimators -- is a function of
the parameters being estimated.
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