R: Sets control arguments

drmc {drc} | R Documentation

## Sets control arguments

### Description

Set control arguments in the control argument in the function 'drm'.

### Usage

      drmc(constr = FALSE, errorm = TRUE, maxIt = 500, method="BFGS",
      noMessage = FALSE, relTol = 1e-07, rmNA=FALSE, useD = FALSE,
      trace = FALSE, otrace = FALSE, warnVal = -1, dscaleThres = 1e-15, rscaleThres = 1e-15)

### Arguments

`constr` | logical. If TRUE optimisation is constrained, only yielding non-negative parameters.
`errorm` | logical specifying whether failed convergence in `drm` should result in an error or only a warning.
`maxIt` | numeric. The maximum number of iterations in the optimisation procedure.
`method` | character string. The method used in the optimisation procedure. See `optim` for available methods.
`noMessage` | logical, specifying whether or not messages should be displayed.
`relTol` | numeric. The relative tolerance in the optimisation procedure.
`rmNA` | logical. Should NAs be removed from sum of squares used for estimation? Default is FALSE (not removed).
`useD` | logical. If TRUE derivatives are used for estimation (if available).
`trace` | logical. If TRUE the trace from `optim` is displayed.
`otrace` | logical. If TRUE the output from `optim` is displayed.
`warnVal` | numeric. If equal to 0 then the warnings are stored and displayed at the end. See under 'warn' in `options`. The default results in suppression of warnings.
`dscaleThres` | numeric value specifying the threshold for dose scaling.
`rscaleThres` | numeric value specifying the threshold for response scaling.

### Value

A list with 8 components, one for each of the above arguments.

### Note

The use of a non-zero constant `bcAdd` may in some cases make it more difficult to obtain convergence of the estimation procedure.

### Author(s)

Christian Ritz

### Examples

    ### Displaying the default settings
    drmc()

    ### Using 'method' argument
    model1 <- drm(ryegrass, fct = LL.4())

    model2 <- drm(ryegrass, fct = LL.4(),
    control = drmc(method = "Nelder-Mead"))

[Package drc version 3.0-1 Index]