Volume of algae as function of increasing concentrations of a herbicide

Description

Dataset from an experiment exploring the effect of increasing concentrations of a herbicide on the volume of the treated algae.

Usage

data(algae)

Format

A data frame with 14 observations on the following 2 variables.

conc

a numeric vector of concentrations.

vol

a numeric vector of response values, that is relative change in volume.

Details

This datasets requires a cubic root transformation in order to stabilise the variance.

Source

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).

Examples

algae.m1 <- drm(vol~conc, data=algae, fct=LL.3())
summary(algae.m1)

algae.m2 <- boxcox(algae.m1)
summary(algae.m2)