Re: [R] ED50 from logistic model with interactions

From: Christian Ritz <>
Date: Wed, 02 May 2007 15:24:27 +0200

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'.

Christian mailing list PLEASE do read the posting guide and provide commented, minimal, self-contained, reproducible code. Received on Wed 02 May 2007 - 13:35:39 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Wed 02 May 2007 - 14:31:23 GMT.

Mailing list information is available at Please read the posting guide before posting to the list.