rpact: Confirmatory Adaptive Clinical Trial Design and Analysis

plot.StageResults {rpact}R Documentation

Stage Results Plotting


Plots the conditional power together with the likelihood function.


## S3 method for class 'StageResults'
plot(x, y, ..., type = 1L, nPlanned,
  stage = x$getNumberOfStages(),
  allocationRatioPlanned = C_ALLOCATION_RATIO_DEFAULT,
  main = NA_character_, xlab = NA_character_, ylab = NA_character_,
  legendTitle = NA_character_, palette = "Set1",
  legendPosition = NA_integer_, showSource = FALSE)



The stage results at given stage, obtained from getStageResults or getAnalysisResults.


Not available for this kind of plot (is only defined to be compatible to the generic plot function).


Optional ggplot2 arguments. Furthermore the following arguments can be defined:

  • thetaRange: A range of assumed effect sizes if testing means or a survival design was specified. Additionally, if testing means was selected, an assumed standard deviation can be specified (default is 1).

  • piRange: A range of assumed rates pi1 to calculate the conditional power. Additionally, if a two-sample comparison was selected, pi2 can be specified (default is the value from getAnalysisResults).

  • directionUpper: The direction of one-sided testing. Default is directionUpper = TRUE which means that larger values of the test statistics yield smaller p-values.

  • thetaH0: The null hypothesis value, default is 0 for the normal and the binary case, it is 1 for the survival case. For testing a rate in one sample, a value thetaH0 in (0,1) has to be specified for defining the null hypothesis H0: pi = thetaH0.


The plot type (default = 1). Note that at the moment only one type (the conditional power plot) is available.


The sample size planned for the subsequent stages. It should be a vector with length equal to the remaining stages and is the overall sample size in the two treatment groups if two groups are considered.


The stage number (optional). Default: total number of existing stages in the data input used to create the stage results.


The allocation ratio for two treatment groups planned for the subsequent stages, the default value is 1.


The main title.


The x-axis label.


The y-axis label.


The legend title.


The palette, default is "Set1".


The position of the legend. By default (NA_integer_) the algorithm tries to find a suitable position. Choose one of the following values to specify the position manually:

  • 0: legend position outside plot

  • 1: legend position left top

  • 2: legend position left center

  • 3: legend position left bottom

  • 4: legend position right top

  • 5: legend position right center

  • 6: legend position right bottom


If TRUE, the parameter names of the object will be printed which were used to create the plot; that may be, e.g., useful to check the values or to create own plots with plot.


Generic function to plot all kinds of stage results. The conditional power is calculated only if effect size and sample size is specified.


design <- getDesignGroupSequential(kMax = 4, alpha = 0.025, 
    informationRates = c(0.2, 0.5, 0.8, 1), 
    typeOfDesign = "WT", deltaWT = 0.25)

dataExample <- getDataset(
    n = c(20, 30, 30),
    means = c(50, 51, 55),
    stDevs = c(130, 140, 120)

stageResults <- getStageResults(design, dataExample, thetaH0 = 20)

if (require(ggplot2)) plot(stageResults, nPlanned = c(30), thetaRange = c(0, 100))

[Package rpact version 2.0.5 Index | www.rpact.org]