A more sensible option in my experience would be to transform the
parameter space to send the boundaries to +/-Inf. Suggested reading for
'nlme' includes Pinheiro and Bates (2000) Mixed-Effects Models in S and
S-Plus (Springer) and Bates and Watts (1988) Nonlinear Regression
Analysis and Its Applications (Wiley).
Spencer Graves
Douglas Bates wrote:
> On 11/19/06, Fluss <[EMAIL PROTECTED]> wrote:
>
>> Hello!
>> I am trying to fit a mixed non-linear model using nlme.
>> How can I constrain the fixed parameter space (add bounds) as in "nls".
>>
>
> By rewriting the nlme function, an option I wouldn't recommend. :-)
>
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