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

This function plots several conditional error functions of the same family such that each one runs through one of several given points.

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`typ` |
type of test: |

`fun` |
a conditional error function |

`dis` |
a distortion method for a supplied conditional error function (see details): |

`p1` |
a vector (at least of length 2) of p-values |

`p2` |
a vector (at least of length 2) of p-values |

`x` |
vector on which the conditional error functions are plotted (should be relatively dense in [0,1]) |

`plt.pt` |
logical determining whether the points that the conditional error functions are made to run through should be plotted or not (default: not) |

`plt.ptann` |
logical determining whether the points that the conditional error functions are made to run through should be annotated or not (default: not) |

`xlab` |
a label for the x axis (default: no label) |

`ylab` |
a label for the y axis (default: no label) |

`...` |
arguments to be passed on to the underlying |

It can be instructive to plot not only one conditional error function, but to visualize a whole family. This can easily be done with `pathCEF`

. The function is used in a similar way as `plotCEF`

, but `p1`

and `p2`

are now vectors (of the same length, at least of length 2). Conditional error functions are plotted that run through the specified elementwise points `(p1,p2)`

(which by default lie on the main diagonal).

Internally, `pathCEF`

uses `plotCEF`

to plot the individual conditional error functions; see this latter function for further details.

The function `pathCEF`

is invoked for its plotting effect; it returns no meaningful value.

Provide either `typ`

or `fun`

, not both! If `fun`

is provided, then also specify `dis`

.

Unlike `plotCEF`

, it is not possible with `pathCEF`

to specify the conditional error functions by the parameter *alpha2* or the parameter *c*.

`plt.ptann`

is not considered if `plt.pt = FALSE`

.

Marc Vandemeulebroecke

Bauer, P., Koehne, K. (1994). Evaluation of experiments with adaptive interim analyses. *Biometrics* 50, 1029-1041.

Lehmacher, W., Wassmer, G. (1999). Adaptive sample size calculations in group sequential trials. *Biometrics* 55, 1286-1290.

Vandemeulebroecke, M. (2006). An investigation of two-stage tests. *Statistica Sinica* 16, 933-951.

`adaptTest`

package description, `CEF`

, `plotCEF`

, `tsT`

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