R: Volume of algae as function of increasing concentrations of a...

algae {drc} | R Documentation

## 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)

[Package drc version 3.0-1 Index]