Multiple changes to predict_mixture.
drc::ED() was replaced with a custom inverse weibull function, which does the same but better.predict_mixture() accepts multiple values for the concentration of the second toxicant. Both concentration vectors must be the same length.predict_mixture() returns a data frame with the concentrations and effects. Previously it was only a vector of effects.predict_mixture() received a new argument "effect_max" which scales the returned effect values.predict_mixture() to use underscore letters a and b instad of 1 and 2. For example model_1 is now model_a.devtools::document()
devtools::check() without errors or warnings