Thank you Charilaos, I think I misunderstood the 'selfStart'. After
checking 'selfStart', I think I don't have the ability to create a
selfStart object. I don't have good sense to guess the initial
values. So I tried 'poor guess' by nls. But I got erroe message as:
Error in c * (ev^2) : non-
On Sep 29, 2007, at 12:00 AM, Niner wrote:
> Hi,
>
> I am a student of Earthquake Engineering, and am new to R.
> Currently I try to run nonlinear regression analysis by R. My data
> has three variables: X, Y, and Z. Z is a function of (X, Y). My R
> script is as below.
In general it is reco
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