FA {drc} | R Documentation |
A single dose-response curve.
data(FA)
A data frame with 24 observations on the following 2 variables.
The data are part of a study to investigate the joint action of phenolic acids on root growth inhibition of perennial ryegrass (Lolium perenne L).
MM is the concentration of ferulic acid in mM, and MEANLR is the root length of perennial ryegrass.
Inderjit and J. C. Streibig, and M. Olofsdotter (2002) Joint action of phenolic acid mixtures and its significance in allelopathy research, Physiologia Plantarum, 114, 422–428, 2002.
## Displaying the data set FA ## Fitting a four-parameter logistic regression ## with user-defined parameter names model1 <- multdrc(MEANLR~MM, data=FA, fct = l4(names = c("Slope", "Lower Limit", "Upper Limit", "ED50"))) ## Getting a summary of the fit summary(model1) ## Fitting a model with very small dose values FA2 <- FA FA2[,2] <- FA2[,2]/1e6 model2 <- multdrc(MEANLR~MM, data=FA2) ## Removing the model objects rm(model1, model2, FA2)