R: Normal and log-normal biphasic dose-response models

gaussian {drc} | R Documentation

## 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

[Package drc version 3.0-1 Index]