66
Possible Remedies
•WRONG:
Ignore missing
–E.g.,
17 of 300 subjects alive at three years
•RIGHT
BUT WRONG QUESTION: Use data only up to earliest censoring time
–E.g.,
149 of 300 subjects alive at one year
•RIGHT
BUT INEFFICIENT: Use only center A
–E.g.,
17 of 100 subjects alive at three years