[R] probit etc. for dose-response modeling

[Thomas Lumley]

On Tue, 27 Aug 2002, Johannes Ranke wrote:

> Hello all
>
> I have done some fitting of pnorm functions to dose-response data, so I could
> calculate EC50 values (dose where the response is 0.5). I used the nlm function
> for this, so I did not get any information about the confidence intervals of
> the fitted parameters.
>
> What would be a good way to do such a probit fit, or is there a package which I
> could use?

Probit models are generalised linear models so you can use glm().

	-thomas

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