#right-censoring

Question 1: Select all that apply

In a churn dataset, customers who are still subscribed only have their tenure so far recorded. Which statements about such right-censored data are true? Select all that apply.

Right censoring means that for some subjects the event has not yet been observed when observation stops1
Right censoring implies that the data are missing completely at random2
With right-censored data, binary classification models can be applied directly without special care3
Ridge regression fitted to the observed tenures of right-censored customers is likely to underestimate tenure4

Timed test