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drc (version 2.1-4)

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

2.1-4

License

GPL-2

Homepage

http://www.r-project.org

Maintainer

Christian Ritz

Last Published

April 10th, 2011

Functions in drc (2.1-4)

Mortality of tobacco budworms

Michaelis-Menten model

The Brain-Cousens hormesis models

Test data from a 21 day fish test

Leaf length of barley

Volume of algae as function of increasing concentrations of a herbicide

Fractional polynomial-logistic dose-response models

Dose-response model for estimation of no effect concentration (NEC).

Information on estimation

Extract fitted values from model

Estimating effective doses

Showing starting values used

Extracting the log likelihood

Dose-response profile of degradation of agrochemical using lepidium

Effect of erythromycin on mixed sewage microorganisms

Two-phase dose-response model

getMeanFunctions

Display available dose-response models

Model-robust dose-response modelling

Competition between two biotypes

Mizon-Richard test for dose-response models

Simulating a dose-response curve

Maximum mean response

Herbicide applied to Galium aparine

Cedergreen-Ritz-Streibig dose-reponse model for describing hormesis

Lack-of-fit test for the mean structure based on cumulated residuals

The four-parameter Weibull functions

Effect of an effluent on the growth of mysid shrimp

Transform-both-sides Box-Cox transformation

Calculating yield loss parameters

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

Mechlorprop and terbythylazine tested on Lemna minor

The Cedergreen-Ritz-Streibig model

The two-parameter log-logistic function

ANOVA for dose-response model fits

Comparing selectivity indices across curves

Expected or predicted response

Simulating ED values under various scenarios

The log-logistic function

Isobutylalcohol in nutrient solution in which lettuce plants were grown

Comparison of effective dose values

Extract Model Coefficients

Confidence Intervals for model parameters

Sets control arguments

Fitting dose-response models

Potency of two herbicides

Effect of technical grade and commercially formulated auxin herbicides

The Cedergreen-Ritz-Streibig model

Effect of ferulic acid on growth of ryegrass

Glyphosate and metsulfuron-methyl tested on algae.

Model function for the universal response surface approach (URSA) for the quantitative assessment of drug interaction

Bread and meat for the sandwich

Example from Finney (1971)

The derivative of the Gompertz function

The effect of terbuthylazin on growth rate

Printing key features

Mean function for the Gompertz dose-response or growth curve

Deguelin applied to chrysanthemum aphis

S.capricornutum

Effect of cadmium on growth of green alga

Creating isobolograms

Inhibition of photosynthesis

The three-parameter Weibull functions

Model selection

Estimation of ED values using model-averaging

Gompertz growth models

Neill's lack-of-fit test for dose-response models

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

The three-parameter log-logistic function

Exponential decay model

Log-normal dose-response model

The five-parameter log-logistic function

Heart rate baroreflexes for rabbits

print.summary.drc

Printing summary of non-linear model fits

Acifluorfen and diquat tested on Lemna minor.

Comparison of parameters

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

Extracting residuals from model

Dose-response profile of degradation of agrochemical using nasturtium

Weight gain for different methionine sources

Vinclozolin from AR in vitro assay

Summarising non-linear model fits

Root length measurements

The Brain-Cousens hormesis models

Asymptotic regression model

The four-parameter log-logistic function

Effect of sodium pentachlorophenate on growth of fathead minnow

The logistic model

The modified baro5 function

Fitting mixture models

Updating and re-fitting a model

Checking the model fot

Weibull model functions

Searching through a range of initial parameter values to obtain convergence

Earthworm toxicity test

The two-parameter Weibull functions