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drc (version 0.9-0)

Analysis of dose-response curves

Description

Non-linear regression analysis for multiple curves with focus on concentration-response, dose-response and time-response curves used, for example, in environmental sciences, pharmacology, toxicology and weed science.

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Version

Install

install.packages('drc')

Monthly Downloads

30,804

Version

0.9-0

License

GNU GPL (version 2 or any later version)

Maintainer

Christian Ritz

Last Published

February 15th, 2017

Functions in drc (0.9-0)

RScompetition

Competition between two biotypes
christensenetal2003

Potency of two herbicides
weibull

The Weibull function
PestSci

Inhibition of photosynthesis
glymet

Glyphosate and metsulfuron-methyl tested on algae.
ml3b

The modified logistic function
SI

Comparing selectivity indices across curves
mixture

Fitting mixture models
mixdrc

Fitting multiple dose-response curves with random effects
diagnostics

Display information on estimation procedure
TM

A suite of bioassays
l5

The five-parameter logistic function
ml3c

The modified logistic function
l2

The two-parameter logistic function
termec

Mechlorprop and terbythylazine tested on Lemna minor
TerMet

The effect of terbuthylazin on growth rate
update.drc

Updating and re-fitting a model
logistic

The logistic function
w3

The three-parameter Weibull function
summary.drc

Summarising non-linear model fits
logLik.drc

Extracting the log likelihood
fitted.drc

Extract fitted values from model
ml3a

The modified logistic function
bcl4

The four-parameter logistic function with Brain-Cousens' modification
print.drc

Printing key features
bcl3

The three-parameter logistic function with Brain-Cousens' modification
ml4a

The modified logistic function
compParm

Comparison of parameters
earthworms

Earthworms
daphnids

Daphnia test
mlogistic

The modified logistic function
l4

The four-parameter logistic function
plot.drc

Plotting fitted curves for a drc object
l3

The three-parameter logistic function
braincousens

The Brain-Cousens modification of the logistic function
vcov.drc

Calculating Variance-Covariance Matrix for objects of class 'drc'
colFct

Collapse of levels
FA

Effect of Ferulic Acid on growth of ryegrass
ml4b

The modified logistic function
cabanne

data name/kind
anova.drc

ANOVA for non-linear model fits
mdControl

Sets control arguments
ml4c

The modified logistic function
ED

Estimating effective dosage
baro5

The modified baro5 function
w2

The two-parameter Weibull function
confint.drc

Confidence Intervals for model parameters
heartrate

Heart rate baroreflexes for rabbits
acidiq

Acifluorfen and diquat tested on Lemna minor.
MAX

Maximum mean response
coef.drc

Extract Model Coefficients
finney71

Example from Finney (1971)
plotraw

Plotting raw dose response data.
hormesis

Hormesis data set
barley

Leaf length of barley
onecurve

Root length
multdrc

Fitting multiple dose-response curves
w4

The four-parameter Weibull function
residuals.drc

Extracting residuals from model
print.summary.drc

Printing summary of non-linear model fits
searchdrc

Searching through a range of initial parameter values to obtain convergence