Does any one know how to calculate/predict the value at some time point (say 90%) based on dose response curve using "drc' in R? I know how to fit the curve with drc. But need to calculate 90% value at some time point. Many thanks. -- View this message in context: http://r.789695.n4.nabble.com/predict-drc-for-specific-point-tp4639820.html Sent from the R help mailing list archive at Nabble.com.