Understanding Beta
The definitive guide to measuring systemic risk and market correlation.
Quick Definition
Beta (β) is a measure of the volatility, or systematic risk, of a security or portfolio in comparison to the broader market. It tells you how much your portfolio is expected to move relative to market swings.
Interpretation Guide
Beta = 1.0
The investment's price activity is strongly correlated with the market.
Beta < 1.0
The investment is less volatile than the market (Defensive).
Beta > 1.0
The investment's price is more volatile than the market (Aggressive).
Beta < 0
The investment is inversely correlated to the market (e.g., Put Options, Gold).
The Formula
Beta = Covariance(Ri, Rm) / Variance(Rm)
Why It Matters
Knowing your portfolio's Beta helps you understand your exposure to broader market crashes. If your Beta is high (e.g., 1.5), and the market drops 10%, your portfolio is statistically expected to drop 15%. This is essential for proper risk management.
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