Learn why correlation—not allocation—is the key to diversification, and how ETFs can help build portfolios with assets that ...

I often teach in my statistics class that correlation should not be confused with causation. That is, observing that two variables move together does not necessarily mean that one variable caused the ...

Correlation doesn't imply causation. You've probably heard that before. It's a true statement that's important in statistical analysis—if more tall people own cats, that doesn't mean that cats cause ...

You often hear the admonition “correlation does not imply causation.” But what exactly is causation? Unlike correlation, which has a specific mathematical meaning, causation is a slippery concept that ...