Description Usage Format Details Source Examples
In an experiment barley was grown in a hydroponic solution with a herbicide.
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A data frame with 42 observations on the following 2 variables.
Dose
a numeric vector
DW
a numeric vector
The dataset exhibits a large hormetical effect.
Nina Cedergreen, Royal Veterinary and Agricultural University, Denmark.
1 2 3 4 5 6 7 8 9 10 11 12 | ## 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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