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author | (no author) <(no author)@d1b72e20-2ee0-0310-a1c4-ad5adbbefcdc> | 2004-07-27 07:36:01 +0000 |
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committer | (no author) <(no author)@d1b72e20-2ee0-0310-a1c4-ad5adbbefcdc> | 2004-07-27 07:36:01 +0000 |
commit | 8154a03c79eb910c42dcff03fd8fa611cdc8cc9d (patch) | |
tree | c4e64967d78078a0fb0a8c9ec85307c35c9ec8f9 /man/drfit.Rd |
First version published on CRAN
git-svn-id: http://kriemhild.uft.uni-bremen.de/svn/drfit@1 d1b72e20-2ee0-0310-a1c4-ad5adbbefcdc
Diffstat (limited to 'man/drfit.Rd')
-rw-r--r-- | man/drfit.Rd | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/man/drfit.Rd b/man/drfit.Rd new file mode 100644 index 0000000..6e39032 --- /dev/null +++ b/man/drfit.Rd @@ -0,0 +1,59 @@ +\name{drfit} +\alias{drfit} +\title{Fit dose-response models} +\description{ + Fit dose-response relationships to dose-response data and calculate + biometric results for (eco)toxicity evaluation +} +\usage{ + drfit(data, startlogEC50 = NA, lognorm = TRUE, logis = FALSE, + linearlogis = FALSE, b0 = 2, f0 = 0) +} +\arguments{ + \item{data}{ + A data frame as returned from \code{\link{drdata}}. The data frame has to + contain at least a factor called "substance", a vector called "unit" + containing the unit used for the dose, a column "response" with the + response values of the test system normalized between 0 and 1 and a column + "dose" with the numeric dose values. For later use of the + \code{\link{drplot}} function, a factor called "dosefactor" also has to be + present, containing the dose as a factor. + } + \item{startlogEC50}{ + Especially for the linearlogis model, a suitable log10 of the EC50 has to be given + by the user, since it is not correctly estimated for data showing hormesis with + the default estimation method.} + \item{lognorm}{ + A boolean defining if cumulative density curves of normal distributions + are fitted to the data. Default ist TRUE.} + \item{logis}{ + A boolean defining if cumulative densitiy curves of logistic distributions + are fitted to the data. Default is FALSE.} + \item{linearlogis}{ + A boolean defining if the linear-logistic function as defined by van Ewijk and Hoekstra + 1993 is fitted to the data. Default is FALSE.} + \item{b0,f0}{ + If the linearlogistic model is fitted, b0 and f0 give the possibility to + adapt the starting values for the parameters b and f.} +} +\value{ + \item{results}{ + A data frame containing at least one line for each substance. If the data did not + show a mean response < 0.5 at the highest dose level, the modeltype is set to "none". + Every successful fit is reported in one line. Parameters of the fitted curves are only + reported if the fitted EC50 is not higher than the highest dose.} + +} +\examples{ +\dontrun{data(antifoul)} +\dontrun{r <- drfit(antifoul)} +\dontrun{format(r,digits=2)} +} +\author{ + Johannes Ranke + \email{jranke@uni-bremen.de} + \url{http://www.uft.uni-bremen.de/chemie/ranke} +} +\keyword{models} +\keyword{regression} +\keyword{nonlinear} |