P.promelas: Effect of sodium pentachlorophenate on growth of fathead...

Description Usage Format Details Source Examples

Description

Fathead minnows (Pimephales promelas) were exposed to sodium pentachlorophenate concentrations ranging from 32 to 512 micro g/L in a 7-day larval survival and growth test. The average dry weight was measured.

Usage

1

Format

A data frame with 24 observations on the following 2 variables.

conc

a numeric vector of sodium pentachlorophenate concentrations (micro g/L).

dryweight

a numeric vector dry weights (mg)

Details

The data are analysed in Bruce and Versteeg (1992) using a log-normal dose-response model (using the logarithm with base 10).

Source

Bruce, R. D. and Versteeg, D. J. (1992) A statistical procedure for modeling continuous toxicity data, Environ. Toxicol. Chem., 11, 1485–1494.

Examples

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## Model with ED50 on log scale as parameter
p.prom.m1<-drm(dryweight~conc, data=P.promelas, fct=LN.3())

plot(fitted(p.prom.m1), residuals(p.prom.m1))

plot(p.prom.m1, type="all", broken=TRUE, xlim=c(0,1000))
summary(p.prom.m1)
ED(p.prom.m1, c(10,20,50), interval="delta")

## Model with ED50 as parameter
p.prom.m2<-drm(dryweight~conc, data=P.promelas, fct=LN.3(loge=TRUE))
summary(p.prom.m2)
ED(p.prom.m2, c(10,20,50), interval="fls")

drc documentation built on May 1, 2019, 8:43 p.m.

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