Leaf length of barley
In an experiment barley was grown in a hydroponic solution with a herbicide.
data(leaflength)
A data frame with 42 observations on the following 2 variables.
Dosea numeric vector
DWa numeric vector
The dataset exhibits a large hormetical effect.
Nina Cedergreen, Royal Veterinary and Agricultural University, Denmark.
## Fitting a hormesis model leaflength.crs4c1 <- drm(DW ~ Dose, data = leaflength, fct = CRS.4c()) plot(fitted(leaflength.crs4c1), residuals(leaflength.crs4c1)) leaflength.crs4c2 <- boxcox(drm(DW ~ Dose, data = leaflength, fct = CRS.4c()), method = "anova", plotit = FALSE) summary(leaflength.crs4c2) ## Plottinf fitted curve and original data plot(leaflength.crs4c2, broken = TRUE, conLevel = 0.001, type = "all", legend = FALSE, ylab = "Produced leaf length (cm)", xlab = "Metsulfuron-methyl (mg/l)", main = "Hormesis: leaf length of barley")
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