daphnia: 'Daphnia Magna' Data

In nlreg: Higher Order Inference for Nonlinear Heteroscedastic Models

Description

The daphnia data frame has 136 rows and 2 columns.

Ecotoxicity study to assess the impact of the herbicide dinoseb on the survival of Daphnia magna Strauss, 1820, a micro-crustacean widely used as test organism in aquatic ecotoxicological assays. The design of the experiment includes 35 irregularly spaced concentrations ranging from 0.006 to 11.3 mg/l and a control group. The upper endpoint of 11.3 mg/l is the highest concentration at which the test substance is soluble in the test medium. The number of replicates per concentration varies from 1 to 11 experimental units. The survival time is measured in days.

Usage

data(daphnia)

Format

This data frame contains the following columns:

conc

the tested concentration (mg/l);

time

the survival time in days.

Source

The data were obtained from

Ch\'evre, N. (2000) Etude et mod\'elisation des effets \'ecotoxiques d'un micropolluant organique sur Daphnia magna et Pseudokirchneriella subcapitata (in French). Ph.D. Thesis N. 2117, Department of Rural Engineering, Swiss Federal Institute of Technology Lausanne.

References

Brazzale, A.R. (2000) Practical Small-Sample Parametric Inference. Ph.D. Thesis N. 2230, Department of Mathematics, Swiss Federal Institute of Technology Lausanne. Section 5.3, Example 5.

Ch\'evre, N., Becker-van Slooten, K., Tarradellas, J., Brazzale, A. R., Behra, R. and Guettinger, H. (2001) Effects of dinoseb on the entire life-cycle of Daphnia magna. Part II: Modelling of survival and proposal of an alternative to No-Observed-Effect-Concentration (NOEC). Environmental Toxicology and Chemistry, 21, 828–833.

Examples

data(daphnia)
attach(daphnia)
plot(conc, time, xlab = "test concentration (mg/l)", 
     ylab = "survival time (d)", log = "y")
detach()

Example output

Loading required package: statmod
Loading required package: survival

   Package "nlreg" 1.2-2 (2014-03-31) 
    Copyright (C) 2000-2014 R. Bellio & A. R. Brazzale

 This is free software, and you are welcome to redistribute
 it and/or modify it under the terms of the GNU General
 Public License published by the Free Software Foundation.
 Package "nlreg" comes with ABSOLUTELY NO WARRANTY.

 type `help(package="nlreg")' for summary information

nlreg documentation built on May 1, 2019, 9:21 p.m.