callsInSingleExperiment
                        Simulation of a single population PDX
                        experiment
getMode                 Function to return the mode of a vector of
                        values
noFalseCalls            Function to calculate the number of false calls
                        for a design for a go-no go threshold
noMissedCalls           Function to calculate the number of missed
                        calls for a design for a go-no go threshold
outcomeInSingleExperiment
                        Function to summarise the results for a single
                        simulation representing one experiment
outcomeMultipleExperiments
                        Function to run simulations to mimic population
                        PDX studies for a defined scenario
plotFalsepositive       A function to visualise the false postive rate
                        as a function of PDXn and PDXr
plotSensitivity         A function to visualise the sensitivity as a
                        function of PDXn and PDXr
populationPDXdesignApp
                        Function 'populationPDXdesignApp'
server                  'shiny' app server function
ui                      'shiny' app user interface function
varyingPDXnPDXrBiolRR   Function to run simulations to mimic population
                        PDX studies for variety of experimental and
                        biological scenarios
