searchdrc: Searching through a range of initial parameter values to...
In drc: Analysis of Dose-Response Curves

Description Usage Arguments Details Value Author(s) Examples

'searchdrc' provides a facility for searching through a range of parameter values (one-dimensional) in order to obtain convergence of the estimation procedure.

1	searchdrc(object, which, range, len = 50)

`object`	an object of class 'drc'. The object can be from a model that could not fitted.
`which`	a character string containing the parameter name
`range`	a numeric vector of length 2 specifying the interval endpoints for the range.
`len`	numeric. The number of points in the interval.

The function goes through the range with increments such that in total at most len sets of parameter values are used as initial values for the estimation procedure. You would need to identify the parameter which is most likely to cause problems for the estimation procedure.

An object of class 'drc'.

Christian Ritz