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drc (version 1.4-2)

Analysis of dose-response curves

Description

Analysis of one or multiple curves with focus on concentration-response, dose-response and time-response curves used, for example in biology, environmental sciences, medicine, pharmacology, toxicology.

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Version

Install

install.packages('drc')

Monthly Downloads

28,339

Version

1.4-2

License

GNU GPL (>= 2)

Maintainer

Christian Ritz

Last Published

February 15th, 2017

Functions in drc (1.4-2)

fitted.drc

Extract fitted values from model
ryegrass

Effect of ferulic acid on growth of ryegrass
LL.3

The three-parameter log-logistic function
LL.4

The four-parameter log-logistic function
baro5

The modified baro5 function
MAX

Maximum mean response
beetGrowth

Example of plant growth curve from Covarelli and Onofri (1998)
LL.2

The two-parameter log-logistic function
S.alba

Potency of two herbicides
RScompetition

Competition between two biotypes
boxcox.drc

Transform-both-sides Box-Cox transformation
earthworms

Earthworms
gompGrowth

Gompertz growth models
residuals.drc

Extracting residuals from model
methionine

Weight gain for different methionine sources
braincousens

The Brain-Cousens hormesis models
acidiq

Acifluorfen and diquat tested on Lemna minor.
vcov.drc

Calculating Variance-Covariance Matrix for objects of class 'drc'
coef.drc

Extract Model Coefficients
BC.5

The Brain-Cousens hormesis models
heartrate

Heart rate baroreflexes for rabbits
daphnids

Daphnia test
getMeanFunctions

Display available dose-response models
colFct

Collapse of levels
compParm

Comparison of parameters
PR

Expected or predicted response
secalonic

Root length
weibull1

The Weibull functions
llogistic

The log-logistic function
multdrc

Fitting multiple dose-response curves
predict.drc

Prediction
print.summary.drc

Printing summary of non-linear model fits
searchdrc

Searching through a range of initial parameter values to obtain convergence
glymet

Glyphosate and metsulfuron-methyl tested on algae.
simDR

Simulating ED values under various scenarios
W1.3

The three-parameter Weibull functions
plotraw

Plotting raw dose response data.
cedergreen

The Cedergreen-Ritz-Streibig model
anova.drc

ANOVA for non-linear model fits
auxins

Effect of technical grade and commerecially formulated auxin herbicides
bread.drc

Bread and meat for the sandwich
finney71

Example from Finney (1971)
print.drc

Printing key features
comped

Comparison of effective dose values
asymreg

Asymptotic regression model
G.aparine

Herbicide applied to Galium aparine
expDecay

Exponential decay model
drmc

Sets control arguments
gompertzd

The derivative of the Gompertz function
leaflength

Leaf length of barley
spinach

Inhibition of photosynthesis
W1.2

The two-parameter Weibull functions
logistic

The logistic (Boltzmann) model
SI

Comparing selectivity indices across curves
mdControl

Sets control arguments
lettuce

Isobutylalcohol in nutrient solution in which lettuce plants were grown
deguelin

Deguelin applied to chrysanthemum aphis
richards

Richards model
logLik.drc

Extracting the log likelihood
rdrm

Simulating a dose-response curve
MM

Michaelis-Menten model
LL.5

The five-parameter log-logistic function
plot.drc

Plotting fitted curves for a 'drc' object
diagnostics

Information on estimation
CRS.5a

The Cedergreen-Ritz-Streibig model
CRS.4a

The Cedergreen-Ritz-Streibig model
drm

Fitting dose-response models
isobole

Creating isobolograms
update.drc

Updating and re-fitting a model
terbuthylazin

The effect of terbuthylazin on growth rate
summary.drc

Summarising non-linear model fits
ED

Estimating effective doses
W1.4

The four-parameter Weibull functions
mixdrc

Fitting multiple dose-response curves with random effects
mecter

Mechlorprop and terbythylazine tested on Lemna minor
confint.drc

Confidence Intervals for model parameters
mixture

Fitting mixture models
mselect

Model selection