Volume of algae as function of increasing concentrations of a herbicide
Dataset from an experiment exploring the effect of increasing concentrations of a herbicide on the volume of the treated algae.
data(algae)
A data frame with 14 observations on the following 2 variables.
conca numeric vector of concentrations.
vola numeric vector of response values, that is relative change in volume.
This datasets requires a cubic root transformation in order to stabilise the variance.
Meister, R. and van den Brink, P. (2000) The Analysis of Laboratory Toxicity Experiments, Chapter 4 in Statistics in Ecotoxicology, Editor: T. Sparks, New York: John Wiley \& Sons, (pp. 114–116).
algae.m1 <- drm(vol~conc, data=algae, fct=LL.3()) summary(algae.m1) algae.m2 <- boxcox(algae.m1) summary(algae.m2)
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