Almost every day you can find in media commentary that XYZ is causing stocks to fall (or rise). Such definitive statements are common—but what’s almost always missing is statistical proof. And if you ...

Altcoins' 14-day average correlation with Bitcoin turned negative for the first time since July 2025, signaling a fragmented crypto market.

The correlation coefficient of the data you saw today. Is there really a causal relationship hidden behind it?There is a ...

In the first case, there is a strong upward-sloping relationship between X and Y; in the second case, no apparent relationship; in the third case, a strong downward-sloping relationship. Note 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 ...

A waiting room at a public health center. A mother three months postpartum is consulting with a public health nurse. The ...

In the first quarter of 2013, the stock of big data has experienced sudden declines followed by sporadic bouts of enthusiasm. The volatility—a new big data “V”—continues this month and Ted Cuzzillo ...

Cross-correlation is a measurement that tracks the movements over time of two variables relative to each other.