Intro to Statistical Learning (2nd Ed), Solution to Problem 11.2c
Q11.2:
We conduct a study with n=4 participants who have just purchased cell phones, in order to model the time until phone replacement. The first participant replaces her phone after 1.2 years. The second participant still has not replaced her phone at the end of the two-year study period. The third participant changes her phone number and is lost to follow up (but has not yet replaced her phone) 1.5 years into the study. The fourth participant replaces her phone after 0.2 years.
For each of the four participants ( i=1,...,4 ), answer the following questions using the notation introduced in Section 11.1:
(a) Is the participant’s cell phone replacement time censored?
(b) Is the value of ci known, and if so, then what is it?
(c) Is the value of ti known, and if so, then what is it?
(d) Is the value of yi known, and if so, then what is it?
(e) Is the value of δi known, and if so, then what is it?
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