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Jun 16, 2023 at 20:57 comment added Mehdi Charife I think that the $x$ is completely unnecessary after the first equality. It should be just $\tau$ instead. Otherwise, what are you trying to convey by making $\tau$ a function of $x$ in the term $\tau(x)$?
Feb 24, 2023 at 0:21 comment added Mkanders I don't know. "Actuaries sometimes call it the Darth Vader rule, for obscure reasons; statisticians are more likely to refer to it as finding the expectatioin by integrating the survival function." Bltzstein/Hwang 2nd Edition, p. 230.
Feb 23, 2023 at 21:48 comment added ryu576 Why do they call it the darth vader rule?
Feb 23, 2023 at 21:18 comment added Mkanders This explanation is reminiscent of what actuaries sometimes call the Darth Vader rule. See Blitztein and Hwang, Ed. 2, page 230. I'm still looking for the best intuitive explanation to use with my students.
Jun 3, 2018 at 23:57 history answered ryu576 CC BY-SA 4.0