[R] dose-response on a grid

William Simpson william.a.simpson at gmail.com
Thu Jul 12 13:01:46 CEST 2007

I have the following problem. I have measured a dose response curve
(binary response, continuous dose) on a grid of x,y positions. I would
like to produce a grey-level plot that shows the LD50 at each (x,y)

I am thinking that I have to do something like
fit<-glm(resp ~ x*y + dose, family = binomial)
Corrections welcome.

But from here I don't know how to get LD50, and certainly not at each
x,y, position.

Thanks very much for any help.


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