I usually focus on something a subset of the population gets wrong, so the rest of us can feel smart, but this week, I’m going bigger and broader, and describing something that you, me, and everyone ...

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 ...

There's no causal link between taking acetaminophen and autism in an offspring, yet some studies point to a correlation. What does that mean? And who should parents listen to?

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 ...

I continue to field comments and e-messages about WHY the stock market will levitate for years to come. Bear market causation is less relevant than your ability to protect your portfolio from the bulk ...

A comment posted by a reader on a recent post reprimanded me for suggesting that marijuana caused relationships to go bad. In this instance the reader was mistaken, as I had specifically used the word ...

Public health is worsening, autism rates are rising — and so are incident conspiracy theories, including claims that the root of the autism evil is vaccines. As the CDC reopens the vaccine-link debate ...

This week, headlines spread quickly after President Donald Trump and Health Secretary Robert F. Kennedy Jr. announced new ...