Optimum of lm

          I am trying to do some D o E. I would like to find 
the optima
(maxima) of a 2 dimensional lm with quadratic terms.
I'm sure there is a really simple solution but i can't find it.

At least part of this problem is solved by the rsm package; that fits a quadratic response surface and provides the location of the maximum together with some diagnostics.

Steve Ellison


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