Log-normal (log-Gaussian) biphasic dose-response model

Model function for fitting symmetric or skewed bell-shaped/biphasic dose-response patterns using the log-Gaussian model. This is the log-transformed variant of the gaussian model.

Usage

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 parameters that are not fixed.

names

a vector of character strings giving the names of the parameters (should not contain ":"). The order of the parameters is: b, c, d, e, f.

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.

Value

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

See also

gaussian, drm

Author

Christian Ritz