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Author Question: Why, in the absence of any other evidence, can't you use data from an observational study to ... (Read 66 times)

Davideckstein7

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on: Jul 24, 2018
Why, in the absence of any other evidence, can't you use data from an observational study to establish a causal link between two measurement variables?

Question 2

Suppose two measurement variables are legitimately related or correlated; does this imply that there is a causal connection between them? Explain why or why not.


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joewallace

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Reply #1 on: Jul 24, 2018
Answer to Question 1

THE SUBJECTS ARE NOT RANDOMLY ASSIGNED TO TREATMENTS; THERE COULD BE CONFOUNDING VARIABLES.

Answer to Question 2

NO. IT DEPENDS ON HOW THE DATA WERE COLLECTED.


Davideckstein7

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Reply #2 on: Jul 24, 2018
Thanks


joewallace

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Reply #3 on: Jul 24, 2018
Welcome :)


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