Category "drc"

coeftest() gives error with drc class object

I am trying to reproduce a supplementary example 2 Continuous response: one dose-response curve from the drc package. When trying to run coeftest(ryegrass.LL.4

Strange ED50 with drc

I am trying to estimate IC50 values with the drc package. Plotting the model works fine. But when I use the ED I get unreasonable results. In my understandi