function - How can I estimate the logarithmic form of data points using R? -


I have data points that represent logarithmic functions.

Is there a way where I can just guess the function which describes this data using R?

Thank you.

I think that you mean that you have vector y and < Code> x and you try to organize the function y (x) = Alog (x) . First of all, the fitting log is a bad idea, because it does not behave well. Fortunately, we have x (y) = exp (y / a) , so we can fit an exponential function which is more convenient, we can use at least sections of this non-alignment : 

  nls (x ~ exp (y / a), start = list (a = 1.), algorithm = "port")

where The initial estimate for start a a . This approach is a numerical optimization, so it can fail.
In a more consistent way, it is a linear function, switching to log (x) and y / a and a straight fit using the LM : 

  LM (log (x) ~ y)

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