Description Usage Arguments Details Value Note Author(s) See Also Examples

'LL.2' and 'LL2.2' provide the two-parameter log-logistic function where the lower limit is fixed at 0 and the upper limit is fixed at 1, mostly suitable for binomial/quantal responses.

1 2 3 4 5 |

`upper` |
numeric value. The fixed, upper limit in the model. Default is 1. |

`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. The default is reasonable. |

`...` |
Additional arguments (see |

The two-parameter log-logistic function is given by the expression

* f(x) = \frac{1}{1+\exp(b(\log(x)-\log(e)))}*

or in another parameterisation

* f(x) = \frac{1}{1+\exp(b(\log(x)-e))}*

The model function is symmetric about the inflection point (*e*).

See `llogistic`

.

This function is for use with the function `drm`

.

Christian Ritz

Related functions are `LL.3`

, `LL.4`

, `LL.5`

and the more general
`llogistic`

.

1 2 3 4 5 6 |

drc documentation built on May 29, 2017, 11:31 a.m.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.