[R] ED50 from logistic model with interactions

Christian Ritz ritz at kvl.dk
Wed May 2 15:24:27 CEST 2007

Hi Kate,

try looking at the package 'drc' on CRAN and in particular look at the 
example in the help page for the dataset 'daphnids' (?daphnids).

You can obtain arbitrary ED values with approximate standard errors 
using the function 'ED'.


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