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Retrospective cohort study #123

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liuchangshiye opened this issue Dec 13, 2022 · 1 comment
Open

Retrospective cohort study #123

liuchangshiye opened this issue Dec 13, 2022 · 1 comment

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@liuchangshiye
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There are mainly two types of cohort study: Prospective Cohort Study and Retrospective Cohort Study.

In the prospective cohort study, we need cohort analysis to study the result of some actions. While in the retrospective cohort study, cohort analysis is needed for exploring the reasons for some outcome.

The big difference between them is the definition of age. The age in the prospective cohort study is a period of time after birth time. But the age in the retrospective cohort study is a period of time before the birth time.

Now COOL supports prospective cohort study. We need to implement the retrospective cohort study as well.
@Zrealshadow
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Propose a detailed example

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@Zrealshadow @liuchangshiye