Correlation
Definition
A statistical measure of how two investments move relative to each other, ranging from -1 (perfect inverse) to +1 (perfect lockstep).
Explanation
Correlation is the foundation of portfolio diversification. If two assets have correlation of +1, they provide no diversification benefit — they move identically. At 0, movements are independent. At -1, they move in opposite directions, providing maximum diversification. In practice, correlations between stocks tend to increase during market crashes (correlation spike), reducing diversification benefits when they're needed most. This is why truly uncorrelated assets (like certain hedge fund strategies or real assets) command premium valuations.
Formula
ρ = Cov(X,Y) / (σx × σy)
How Stoquity Uses This
Stoquity incorporates correlation analysis across its portfolio management platform, providing real-time monitoring and AI-powered insights for every portfolio.