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Questions - nls

Possible Package conflicts with minpack.lm for nlsLM optimization

Question: Can tidyverse, ggplot2, and dplyr conflict with minpack.lm in a way that causes nlsLM to give this error below? "Error in numericDeriv(form[[3L]], names(ind), env) : Missing value o...
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Toy L

r

package

nls

Votes: 0

Answers: 1

Latest Answer

It's both It's both of the masked functions that cause the problem. However, you an call still call tidyverse. (ggplot2 and dplyr are already called, when you call tidyverse, so calling them again isn...
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Kat

Using nls or nlsLM to fit global and group-specific parameters

I would like to use nls to fit a global parameter and group-specific parameters. The closest I have found to a minimum reproducible example is below (found here: https://stat.ethz.ch/pipermail/r-help/...
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MikeG

r

parameters

grouping

nls

Votes: 0

Answers: 2

Latest Answer

I think you can do this much more easily with nlme::gnls: fit2 <- nlme::gnls(y~1/(b+x^p), params = list(p~group-1, b~1), data=d, start = list(b=1, p = rep(3,3))) ...
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Ben Bolker

How to calculate by hand standard errors and t statistics of minpack.lm::nlsLM?

Let's consider this code as an example: a = 10 b = 2 c = 1.05 set.seed(123,kind="Mersenne-Twister",normal.kind="Inversion") x = runif(100) data = data.frame(X = x, Y = a + b/c * ((...
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Barbab

r

statistics

nls

standard-error

Votes: 0

Answers: 0

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