One interesting point about regression analysis though is that its outcome is perfectly fit to be exploited by marketing &amp; advertising. explaining all the caveats of an experiment is hard, but saying that &quot;people who eat X have less probability of getting cancer&quot; is very powerful. So, in a way, I suspect these type of studies (regression) are &quot;pulled&quot; by marketing rather than pusghed by Research (at least for corporate sponsored studies)