The 4-Hour Body - An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman - Timothy Ferriss
Observational studies cannot control or even document all of the variables involved.
Observational studies cannot control or even document all of the variables involved.
Observational studies can only show correlation: A and B both exist at the same time in one
group. They cannot show cause and effect.4
In contrast, randomized and controlled experiments control variables and can therefore show
cause and effect (causation): A causes B to happen.
The satirical religion Pastafarianism purposely confuses correlation and causation:
With a decrease in the number of pirates, there has been an increase in global warming
over the same period.
Therefore, global warming is caused by a lack of pirates.
Even more compelling:
Somalia has the highest number of Pirates AND the lowest Carbon emissions of any
country. Coincidence?
Drawing unwarranted cause-and-e ect conclusions from observational studies is the bread-
annaabi.ee 
