drfit: Dose-response data evaluation
drfit provides basic and easy-to-use functions for fitting
dose-response curves to dose-response data, calculating some
(eco)toxicological parameters and plotting the results.
Functions that are fitted are the cumulative density function
of the lognormal distribution (probit fit), of the logistic
distribution (logit fit), of the weibull distribution (weibull
fit) and a linear-logistic model ("linlogit" fit), derived from
the latter, which is used to describe data showing stimulation
at low doses (hormesis). In addition, functions checking,
plotting and retrieving dose-response data retrieved from a
database accessed via RODBC are included.