With two different risky assets, an investor can minimize total portfolio volatility through the combination of investments with low to negative correlation. In a higher yield environment, 60/40 can ...

If you read a lot, like me, you might notice almost daily there’s a new study that contradicts some earlier research. Something causes cancer — then it’s good for you. You know the drill. What’s going ...

After reading Dalton Conley’s piece on recent developments in social-science research (“The Data in Your Lap: How to Interpret Naturally Occurring Experiments,” The Review, December 19), I can only ...

We’ve all been told that correlation does not imply causation. Yet many business leaders, elected officials, and media outlets still make causal claims based on misleading correlations. These claims ...