R: Test data from a 21 day fish test

O.mykiss {drc} | R Documentation

## 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)

### Details

Weights are measured after 28 days.

### 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).

### 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)

[Package drc version 3.0-1 Index]