How could a longitudinal observational study ensure 'time order'?
A) value the outcome before the predictor variable
B) measure the predictor and outcome at the same time
C) sort the data by ascending time for the outcome
D) measure the predictor before the outcome

Question

Quizplus · Accepted Answer

In a longitudinal observational study, ensuring 'time order' means establishing a clear temporal sequence between the predictor and the outcome. Measuring the predictor before the outcome ensures that the predictor indeed precedes the outcome, which is crucial for establishing a potential causal relationship.

How Could a Longitudinal Observational Study Ensure 'Time Order