What's the intuition behind the following relationship: 
Definitions:
Retrospective Study
A research method that examines historical data from past records to study outcomes or disease progression.
Prospective Study
An observational study in which participants are followed over time to observe outcomes, such as the development of a disease.
Correlational Study
A research method that examines the relationship between two or more variables to determine if they move together in any way.
Ex Post Facto
A Latin term meaning "from after the fact," often used in legal contexts to describe laws that apply retroactively.
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