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drc (version 1.6-3)

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

58,200

Version

1.6-3

License

GPL (>= 2)

Homepage

http://www.r-project.org

Maintainer

Christian Ritz

Last Published

April 14th, 2009

Functions in drc (1.6-3)

Comparing selectivity indices across curves

Weight gain for different methionine sources

Log-normal dose-response model

Herbicide applied to Galium aparine

Expected or predicted response

The two-parameter log-logistic function

Asymptotic regression model

Deguelin applied to chrysanthemum aphis

Sets control arguments

Fitting dose-response models

The Cedergreen-Ritz-Streibig model

The derivative of the Gompertz function

Bread and meat for the sandwich

Effect of sodium pentachlorophenate on growth of fathead minnow

Earthworm toxicity test

Mechlorprop and terbythylazine tested on Lemna minor

The three-parameter Weibull functions

Extracting the log likelihood

Weibull model functions

Vinclozolin from AR in vitro assay

Inhibition of photosynthesis

Effect of ferulic acid on growth of ryegrass

Potency of two herbicides

Maximum mean response

Transform-both-sides Box-Cox transformation

Isobutylalcohol in nutrient solution in which lettuce plants were grown

Fitting multiple dose-response curves with random effects

The logistic model

Printing key features

Calculating yield loss parameters

The Brain-Cousens hormesis models

Leaf length of barley

The four-parameter Weibull functions

The modified baro5 function

Competition between two biotypes

Heart rate baroreflexes for rabbits

Creating isobolograms

print.summary.drc

Printing summary of non-linear model fits

Fitting mixture models

The Cedergreen-Ritz-Streibig model

Simulating ED values under various scenarios

Example from Finney (1971)

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

Updating and re-fitting a model

The Cedergreen-Ritz-Streibig model

The five-parameter log-logistic function

ANOVA for non-linear model fits

Test data from a 21 day fish test

getMeanFunctions

Display available dose-response models

Extract Model Coefficients

Extracting residuals from model

Checking the model fot

Comparison of effective dose values

Exponential decay model

The four-parameter log-logistic function

Mortality of tobacco budworms

Michaelis-Menten model

S.capricornutum

Effect of cadmium on growth of green alga

Effect of technical grade and commercially formulated auxin herbicides

Acifluorfen and diquat tested on Lemna minor.

Volume of algae as function of increasing concentrations of a herbicide

The two-parameter Weibull functions

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

The Brain-Cousens hormesis models

Comparison of parameters

Extract fitted values from model

Information on estimation

Confidence Intervals for model parameters

Gompertz growth models

Dose-response profile of degradation of agrochemical using nasturtium

Simulating a dose-response curve

Model-robust dose-response modelling

Summarising non-linear model fits

The effect of terbuthylazin on growth rate

Estimating effective doses

The log-logistic function

Dose-response profile of degradation of agrochemical using lepidium

Model selection

Glyphosate and metsulfuron-methyl tested on algae.

Searching through a range of initial parameter values to obtain convergence

Effect of an effluent on the growth of mysid shrimp

Mean function for the Gompertz dose-response or growth curve

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

The three-parameter log-logistic function