Suppose that a doctor prescribes surgery (labeled 1) or drug (labeled 0) for a c
ID: 3178357 • Letter: S
Question
Suppose that a doctor prescribes surgery (labeled 1) or drug (labeled 0) for a certain condition. The doctor randomly assigns each patient to the treatment by flipping a coin. After six weeks the survival of each patient is recorded. The survival of the two groups are compared at the end of the study. Which of the following is TRUE.
If the coin has a known bias (e.g., the probability of a head is 0.7) then the study will be an observational study.
The doctor assigns patients to the treatment based on how long they will survive while taking the treatment.
The treament assignment ignorable.
The treament assignment is non-ignorable.
The treatment assignment depends on the potential outcomes.
Explanation / Answer
Result:
Suppose that a doctor prescribes surgery (labeled 1) or drug (labeled 0) for a certain condition. The doctor randomly assigns each patient to the treatment by flipping a coin. After six weeks the survival of each patient is recorded. The survival of the two groups are compared at the end of the study. Which of the following is TRUE.
If the coin has a known bias (e.g., the probability of a head is 0.7) then the study will be an observational study.
The doctor assigns patients to the treatment based on how long they will survive while taking the treatment.
Answer: The treament assignment ignorable.
The treament assignment is non-ignorable.
The treatment assignment depends on the potential outcomes.
A missing data mechanism such as a treatment assignment is "ignorable" if the missing data matrix, which indicates which variables are observed or missing, is independent of the missing data conditional on the observed data.
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