probit.trans: Probit-transform the data and apply Abbott's correction
Description
This function applies probit transformation to the data, after applying
Abbott's correction (see reference) when control groups (e.g. unexposed
susceptible strain) show non-negligible mortality.
Usage
probit.trans(dataf, conf = 0.05)
Value
Returns a list. convrg: with correction values and convergence
(NULL if mortality in the controls is below conf.), tr.data: transformed
data
Arguments
dataf
a data frame of mortality data containing four mandatory
columns "strain", "dose", "total", "dead" (not necessarily in that order).
conf
numerical. Threshold for the mortality in the controls above
which the correction should be applied (default=0.05)
Author
Pascal Milesi, Piyal Karunarathne, Pierrick Labbé
References
Abbott, WS (1925). A method of computing the effectiveness of
an insecticide. J. Econ. Entomol.;18:265‐267.