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drc (version 1.6-1)

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

1.6-1

License

GPL (>= 2)

Homepage

http://www.r-project.org

Maintainer

Christian Ritz

Last Published

March 25th, 2009

Functions in drc (1.6-1)

The three-parameter log-logistic function

Effect of an effluent on the growth of mysid shrimp

The five-parameter log-logistic function

The four-parameter Weibull functions

Asymptotic regression model

Effect of sodium pentachlorophenate on growth of fathead minnow

Volume of algae as function of increasing concentrations of a herbicide

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

Mortality of tobacco budworms

Potency of two herbicides

The log-logistic function

The Cedergreen-Ritz-Streibig model

The Cedergreen-Ritz-Streibig model

Plotting fitted curves for a 'drc' or 'mrdrc' object

Michaelis-Menten model

The logistic model

Simulating a dose-response curve

The effect of terbuthylazin on growth rate

print.summary.drc

Printing summary of non-linear model fits

The two-parameter Weibull functions

Dose-response profile of degradation of agrochemical using lepidium

Checking the model fot

Inhibition of photosynthesis

Updating and re-fitting a model

Comparing selectivity indices across curves

Acifluorfen and diquat tested on Lemna minor.

The two-parameter log-logistic function

Expected or predicted response

Bread and meat for the sandwich

Log-normal dose-response model

Dose-response profile of degradation of agrochemical using nasturtium

Extracting residuals from model

Summarising non-linear model fits

Fitting multiple dose-response curves with random effects

Weibull model functions

The three-parameter Weibull functions

Extract fitted values from model

Printing key features

Simulating ED values under various scenarios

Calculating yield loss parameters

Example from Finney (1971)

Gompertz growth models

Weight gain for different methionine sources

The Cedergreen-Ritz-Streibig model

The four-parameter log-logistic function

S.capricornutum

Effect of cadmium on growth of green alga

The Brain-Cousens hormesis models

Extract Model Coefficients

Isobutylalcohol in nutrient solution in which lettuce plants were grown

Mechlorprop and terbythylazine tested on Lemna minor

Creating isobolograms

Fitting mixture models

Herbicide applied to Galium aparine

Test data from a 21 day fish test

Maximum mean response

Transform-both-sides Box-Cox transformation

Effect of technical grade and commercially formulated auxin herbicides

Sets control arguments

Fitting dose-response models

Heart rate baroreflexes for rabbits

Comparison of parameters

Mean function for the Gompertz dose-response or growth curve

Deguelin applied to chrysanthemum aphis

Extracting the log likelihood

Model-robust dose-response modelling

The Brain-Cousens hormesis models

Effect of ferulic acid on growth of ryegrass

The derivative of the Gompertz function

Calculating variance-covariance matrix for objects of class 'drc'

The modified baro5 function

Leaf length of barley

Exponential decay model

Information on estimation

Model selection

getMeanFunctions

Display available dose-response models

Vinclozolin from AR in vitro assay

Confidence Intervals for model parameters

Estimating effective doses

Competition between two biotypes

ANOVA for non-linear model fits

Glyphosate and metsulfuron-methyl tested on algae.

Comparison of effective dose values

Searching through a range of initial parameter values to obtain convergence