sim_crossover_delay: Simulation with treatment switching at a time
In borealexander/tslrt: Function for treatment switching logrank test

sim_crossover_delay Simulating a trial with crossover effect. Control and experimental arm are both exponentially distributed, but control switches treatment after a delay time

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sim_crossover_delay(n_c = 100, n_e = 100, median_c_1 = 10,
  median_c_2 = 12.5, median_e = 15, delay = 3, p_change = 1,
  end_event = 150, rec_period = 12, rec_power = 1, model = NULL)

`n_c`	Number of patients in control arm
`n_e`	Number of patients in experimental arm
`median_c_1`	Median in control arm for the first time period
`median_c_2`	Median in control arm for the second time period
`median_e`	Median in experimental arm
`delay`	Time at which to change treatment in control
`p_change`	Probability that a patient in control that has a progression changes to experimental arm
`end_event`	Number of events to stop the study
`rec_period`	Recruitment period
`rec_power`	Recruitment follows a power model, this variable how the power looks
`model`	List containing all the variabels above