Dear all, I tried help.search("karber") and RSiteSearch("karber") and RSiteSearch("*karber*") to find whether the (trimmed) Spearman-Karber method for LD50 evaluation in toxicity data (e.g. according to Hamilton 1977) has been implemented in R. Or does this method feature under a different name? Of course logit and probit are doable, but Spearman-Karber seems to me to be the way I should go with our data. Thanks for all your help, Susanne Institute of Groundwater Ecology ph +49 89 3187-2567 fax +49 89 3187-3361 susanne.schmidt@helmholtz-muenchen.de <mailto:susanne.schmidt@helmholtz-muenchen.de> www.helmholtz-muenchen.de/igoe/ <http://www.helmholtz-muenchen.de/igoe/> Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH) German Research Center for Environmental Health (GmbH) Ingolstädter Landstr. 1 85764 Neuherberg Germany www.helmholtz-muenchen.de <http://www.helmholtz-muenchen.de> Aufsichtsratsvorsitzender: MinDir Dr. Peter Lange Geschäftsführer: Prof. Dr. Günther Wess und Dr. Nikolaus Blum Registergericht: Amtsgericht München HR 6466 [[alternative HTML version deleted]]