pletely removed the effects of other variables. The fact that other factors may explain the relationship between saturated fat intake and death is an example of why introductory statistics classes often teach that “correlation does not imply causation”, though the renowned data visualization expert Edward Tufte has added, “but it sure is a hint.”</p>
<p>Although observational research (like the PURE study) cannot conclusively demonstrate causal relations, we generally think that causation can be dem