This is a special function used in the context of multivariate frailty model with two types of recurrent events and a terminal event
(e.g., censoring variable related to both recurrent events). It contains the indicator of the recurrent event of type 2, normally 0=no event, 1=event, and is used on the right hand side of a formula of a 'multivPenal' object. Using
event2() in a formula implies that a multivariate frailty model for two types of recurrent events and a terminal event is fitted.
A numeric variable but should be a boolean which equals 1 if the subject has experienced an event of type 2 and 0 if not.
an indicator for an event of type 2
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