Dear R-users,
Can someone help understand why in the following example R would return a negative value for the last parameter when I have constrained it to be positive and greater than or equal to 0.01?
 
> nlminb(start=initial value,objective=some function, lower=c(-Inf,-Inf,-Inf,0.01),upper=c(Inf,Inf,Inf,Inf))
Many thanks,
Dominique
 
 
Dominique Katshunga
==============
Lecturer in Statistical Sciences Department
University of Cape Town
Tel. 021 6504669
Fax. 021 6504773
email. dominique.katshunga@uct.ac.za

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