Ecological study is an observational study at population/group level
Cross sectional study is an observational study in which investigator measures the exposure and outcome at the same point in time
Case Control study
It compares two groups of people namely those with the disease(cases) and a very similar group with without the disease(controls)
Cohort study
Cohort studies are a type of longitudinal study in which the investigator follow participants who share a common characteristic, such as a particular occupation or demographic similarity
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