This creates a RCurve object for a piecewise-linear recruitment distribution.
RCurve objects contain all necessary information to describe a recruitment distribution. They are a particular type of Curve object containing additional recruitment-related information, including patient numbers and the randomisation ratio.
2-column matrix with recruitment parameters. First column gives the lengths of each period of recruitment. Second column gives the corresponding rates of recruitment for each period.
Randomisation ratio; active arm divided by control arm.
This RCurve is used when it is expected that patients enter a trial at a rate that varies over time.
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