Why do investigators use the odds ratio in a case-control study instead of a risk or rate ratio to measure the strength of the association between an exposure and a disease

Why do investigators use the odds ratio in a case-control study instead of a risk or rate ratio to measure the strength of the association between an exposure and a disease? 

2.) . State an important difference and an important similarity between experimental and cohort studies. 

3.) What is the main difference between simple and factorial trial designs as they relate to experimental studies?

4.) Describe the ecological fallacy, and provide a real-world example.  

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