Toxicity trial for insects
A data frame of a toxicity trial.
data(finney44)
A data frame with 6 observations on the following 3 variables.
pconca numeric vector, percent concentration of pyrethrins.
hatchednumber of eggs that hatched.
unhatchednumber of eggs that did not hatch.
Finney (1944) describes a toxicity trial of five different concentrations of pyrethrins (percent) plus a control that were administered to eggs of Ephestia kuhniella. The natural mortality rate is large, and a common adjustment is to use Abbott's formula.
Finney, D. J. (1944). The application of the probit method to toxicity test data adjusted for mortality in the controls. Annals of Applied Biology, 31, 68–74.
Abbott, W. S. (1925). A method of computing the effectiveness of an insecticide. Journal of Economic Entomology, 18, 265–7.
data(finney44) transform(finney44, mortality = unhatched / (hatched + unhatched))
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