Good afternoon,
I need to fit a nonlinear regression function of the form:
y = erfc[2 * sqrt(b)] * x
where erfc is complementary error function and b is the only parameter to be estimated, with the initial value b=1.
Can someone help me with the appropriate nl command? I cannot find anything under help erfc or help erf.
Thank you very much in advance!
Piotr Lewczuk
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