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Constrained fits: y~a+b*x-c*x^2, with a,b,c >=0

Liaw, Andy 
There's also the "nnls" (non-negative least squares) package on CRAN
that might be useful, although I'm puzzled by the negative sign in front
of c in Alex post...

Cheers,
Andy 

From: Berwin A Turlach
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Alex van der Spek Constrained fits: y~a+b*x-c*x^2, with a,b,c >=0 May 27 Berwin A Turlach Constrained fits: y~a+b*x-c*x^2, with a,b,c >=0 May 27 Liaw, Andy Constrained fits: y~a+b*x-c*x^2, with a,b,c >=0 May 27