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drc (version 1.8-1)

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

58,200

Version

1.8-1

License

GPL (>= 2)

Homepage

http://www.r-project.org

Maintainer

Christian Ritz

Last Published

January 12th, 2010

Functions in drc (1.8-1)

Dose-response profile of degradation of agrochemical using lepidium

S.capricornutum

Effect of cadmium on growth of green alga

Michaelis-Menten model

The Brain-Cousens hormesis models

The two-parameter log-logistic function

Acifluorfen and diquat tested on Lemna minor.

Transform-both-sides Box-Cox transformation

Mortality of tobacco budworms

The four-parameter log-logistic function

Bread and meat for the sandwich

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

Estimating effective doses

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

ANOVA for dose-response model fits

Test data from a 21 day fish test

Comparing selectivity indices across curves

Extract Model Coefficients

Fitting dose-response models

Checking the model fot

Printing key features

The logistic model

Dose-response profile of degradation of agrochemical using nasturtium

Effect of ferulic acid on growth of ryegrass

Mizon-Richard test for dose-response models

The four-parameter Weibull functions

Potency of two herbicides

Confidence Intervals for model parameters

Effect of technical grade and commercially formulated auxin herbicides

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

Extract fitted values from model

Deguelin applied to chrysanthemum aphis

Vinclozolin from AR in vitro assay

Continuous data from ECVAM

Exponential decay model

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

The Brain-Cousens hormesis models

Effect of an effluent on the growth of mysid shrimp

Mean function for the Gompertz dose-response or growth curve

Gompertz growth models

The three-parameter Weibull functions

Earthworm toxicity test

Calculating yield loss parameters

The modified baro5 function

Information on estimation

Comparison of parameters

Example from Finney (1971)

Effect of erythromycin on mixed sewage microorganisms

Fractional polynomial-logistic dose-response models

Effect of sodium pentachlorophenate on growth of fathead minnow

Maximum mean response

Sets control arguments

Expected or predicted response

getMeanFunctions

Display available dose-response models

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

Isobutylalcohol in nutrient solution in which lettuce plants were grown

The log-logistic function

Model selection

Estimation of ED values using model-averaging

The derivative of the Gompertz function

Fitting multiple dose-response curves with random effects

Fitting mixture models

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

Model-robust dose-response modelling

print.summary.drc

Printing summary of non-linear model fits

The effect of terbuthylazin on growth rate

Summarising non-linear model fits

Mechlorprop and terbythylazine tested on Lemna minor

Extracting residuals from model

Searching through a range of initial parameter values to obtain convergence

Weibull model functions

Simulating ED values under various scenarios

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

Weight gain for different methionine sources

Two-phase dose-response model

Simulating a dose-response curve

The Cedergreen-Ritz-Streibig model

Asymptotic regression model

The three-parameter log-logistic function

The five-parameter log-logistic function

Competition between two biotypes

Leaf length of barley

Volume of algae as function of increasing concentrations of a herbicide

Showing starting values used

Glyphosate and metsulfuron-methyl tested on algae.

Extracting the log likelihood

Inhibition of photosynthesis

Creating isobolograms

Root length measurements

Updating and re-fitting a model

The two-parameter Weibull functions

The Cedergreen-Ritz-Streibig model

Herbicide applied to Galium aparine

Heart rate baroreflexes for rabbits

Log-normal dose-response model