drplot(drfit)R Documentation

Plot dose-response models

Description

Produce graphics of dose-response data and dose-response relationships either combined or separately, for one or more substances.

Usage

  drplot(drresults, data, dtype, alpha, path, fileprefix, overlay,
    postscript, color, colors, fitcolors)

Arguments

drresults A data frame as returned from drfit.
data A data frame as returned from drdata. If data is to be plotted, 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, a column "dose" with the numeric dose values and a factor called "dosefactor" containing the dose as a factor. If plotting of the data is not required, data can be set to FALSE.
dtype A string describing if the raw data should be plotted ("raw"), or an error bar should be constructed from the standard deviations of the responses at each dose level ("std", default value) or from the confidence intervals ("conf"). Of course, dtype only makes a difference, if a valid data object has been referenced.
alpha The confidence level, defaulting to 0.95, only used if dtype "conf" has been chosen.
path The path where graphic files should be put if any are produced. Defaults to "./" i.e. the current working directory of R.
fileprefix A string which will form the beginning of each filename, if graphic files are created. Defaults to "drplot".
overlay If TRUE, all output will be put into one graph, otherwise a separate graph will be created for each substance. In the latter case, on-screen display (postscript=FALSE) only works correctly for data plots. Dose-response models will all be put into the last graph in this case.
postscript If TRUE, (a) postscript graph(s) will be created. Otherwise, graphics will be displayed with a screen graphics device.
color If TRUE, a sensible selection of colors will be attempted. If false, everything will be drawn in black
colors This is a vector of colors, defaulting to 1:8, used for plotting the data.
fitcolors Here you can specify a palette for the colors of the dose-response fits. The default value is "default", which produces rainbow colors.

Value

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.

Author(s)

Johannes Ranke jranke@uni-bremen.de http://www.uft.uni-bremen.de/chemie/ranke

Examples

## Not run: data(antifoul)
## Not run: r <- drfit(antifoul)
## Not run: format(r,digits=2)
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