Message-ID: <20020828062426.GA30325@eckehaat.uft.uni-bremen.de>
Date: 2002-08-28T06:24:27Z
From: Johannes Ranke
Subject: probit etc. for dose-response modeling
In-Reply-To: <Pine.A41.4.44.0208270852540.118758-100000@homer41.u.washington.edu>
Hi again
I found that the nonlinear least squares method also works nicely:
library(nls)
model <- nls(viability ~ pnorm(-log10(conc),-EC50,slope),data=data, \
start=list(EC50=1.8,slope=0.8))
Is there an advantage of using glm, and how would this work in this case?
Johannes
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