How can I use an equation with a natural Logarithm in R’s NLS Function?
In R, the NLS function is used for non-linear least squares fitting.
If you need to include a natural logarithm in your model, you can use the log function within the formula.
Here is an example:
Sample data
x <- c (1, 2, 3, 4, 5)
y <- c (2.3, 3.1, 4.2, 5.1, 6.3)
Define the model equation with natural logarithm
model <- y ~ a log(x) + b
Fit the model using NLS
fit <- NLS (model, start = c (a = 1, b = 1))
Print the summary of the fit
summary(fit)
In this example, log (x) computes the natural logarithm of x. The start argument is used to provide initial values for the parameters and b. The summary function is used to print the summary of the fit.