Description Usage Arguments Details Value Note Author(s) References See Also Examples
'LL.5' and 'LL2.5' provide the five-parameter log-logistic function, self starter function and names of the parameters.
1 2 3 4 5 |
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 five-parameter logistic function is given by the expression
f(x) = c + \frac{d-c}{(1+\exp(b(\log(x)-\log(e))))^f}
or in another parameterisation
f(x) = c + \frac{d-c}{(1+\exp(b(\log(x)-e)))^f}
The function is asymmetric for f different from 1.
See llogistic
.
This function is for use with the function drm
.
Christian Ritz
Finney, D. J. (1979) Bioassay and the Practise of Statistical Inference, Int. Statist. Rev., 47, 1–12.
Related functions are LL.4
and LL.3
.
1 2 |
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.