Fit a probit regression to dose-effect data, using the log10 of the dose as the response.
A data frame of toxicity data, including at least three variables: dose (the concentration of the tested chemical), ntot (the number of individuals tested), and nfx (the number of affected individuals).
Only those rows with
dose > 0,
ntot > 0, and
nfx >= 0
are used in fitting the model.
A an object of class
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