Learn R Programming

EnvStats (version 3.0.0)

Graham.et.al.75.etu.df: Ethylene Thiourea Dose-Response Data

Description

These data are the results of an experiment in which different groups of rats were exposed to different concentration levels of ethylene thiourea (ETU), which is a decomposition product of a certain class of fungicides that can be found in treated foods (Graham et al., 1975; Rodricks, 1992, p.133). In this experiment, the outcome of concern was the number of rats that developed thyroid tumors.

Usage

Graham.et.al.75.etu.df

Arguments

Format

A data frame with 6 observations on the following 4 variables.

dose

a numeric vector of dose (ppm/day) of ETU.

tumors

a numeric vector indicating number of rats that developed thyroid tumors.

n

a numeric vector indicating the number of rats in the dose group.

proportion

a numeric vector indicating proportion of rats that developed thyroid tumors.

References

Rodricks, J.V. (1992). Calculated Risks: The Toxicity and Human Health Risks of Chemicals in Our Environment. Cambridge University Press, New York, p.133.