drc (version 2.5-12)

O.mykiss: Test data from a 21 day fish test

Description

Test data from a 21 day fish test following the guidelines OECD GL204, using the test organism Rainbow trout Oncorhynchus mykiss.

Usage

data(O.mykiss)

Format

A data frame with 70 observations on the following 2 variables.

conc

a numeric vector of concentrations (mg/l)

weight

a numeric vector of wet weights (g)

Source

Organisation for Economic Co-operation and Development (OECD) (2006) CURRENT APPROACHES IN THE STATISTICAL ANALYSIS OF ECOTOXICITY DATA: A GUIDANCE TO APPLICATION - ANNEXES, Paris (p. 65).

Details

Weights are measured after 28 days.

References

Organisation for Economic Co-operation and Development (OECD) (2006) CURRENT APPROACHES IN THE STATISTICAL ANALYSIS OF ECOTOXICITY DATA: A GUIDANCE TO APPLICATION - ANNEXES, Paris (pp. 80--85).

Examples

head(O.mykiss)

## Fitting exponential model
O.mykiss.m1 <- drm(weight ~ conc, data = O.mykiss, fct = EXD.2(), na.action = na.omit)
modelFit(O.mykiss.m1)
summary(O.mykiss.m1)

## Fitting same model with transform-both-sides approach
O.mykiss.m2 <- boxcox(O.mykiss.m1 , method = "anova")
summary(O.mykiss.m2)
# no need for a transformation

## Plotting the fit
plot(O.mykiss.m1, type = "all", xlim = c(0, 500), ylim = c(0,4),
xlab = "Concentration (mg/l)", ylab = "Weight (g)", broken = TRUE)