gaussian {drc}

Normal and log-normal biphasic dose-response models

Description

Model functions for fitting symmetric or skewed bell-shaped/biphasic dose-response patterns.

Usage

    gaussian(fixed = c(NA, NA, NA, NA, NA), names = c("b", "c", "d", "e", "f"), 
    method = c("1", "2", "3", "4"), ssfct = NULL, fctName, fctText, loge = FALSE)
    
    lgaussian(fixed = c(NA, NA, NA, NA, NA), names = c("b", "c", 
    "d", "e", "f"), method = c("1", "2", "3", "4"), ssfct = NULL, 
    fctName, fctText, loge = FALSE)

Arguments

fixed

numeric vector. Specifies which parameters are fixed and at what value they are fixed. NAs for parameter that are not fixed.

names

a vector of character strings giving the names of the parameters (should not contain ":"). The default is reasonable (see under 'Usage'). The order of the parameters is: b, c, d, e, f (see under 'Details').

method

character string indicating the self starter function to use.

ssfct

a self starter function to be used.

fctName

optional character string used internally by convenience functions.

fctText

optional character string used internally by convenience functions.

loge

logical indicating whether or not e or log(e) should be a parameter in the model. By default e is a model parameter.

Details

Details yet to be provided.

Value

The value returned is a list containing the nonlinear function, the self starter function and the parameter names.

Note

The functions are for use with the function drm.

Author(s)

Christian Ritz