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Standard Deviation
Meaning of Standard Deviation
Standard deviation is a statistical measure used to show how much an investment’s returns deviate from its expected or average return. It indicates the degree of dispersion of returns around the mean value.
Role in Investment Decisions
Standard deviation is widely used in investment analysis to measure historical volatility. It helps investors understand how stable or unstable an investment’s returns have been over time. The greater the deviation from the average return, the higher the uncertainty associated with the investment.
Interpretation of Risk
A stock with a high standard deviation experiences large fluctuations in returns, indicating higher volatility and higher risk. Conversely, a stock with a low standard deviation shows more consistent returns and is considered less risky.
Simple Example
Stock A has an average annual return of 8%. Over several years, its returns range between 6% and 10%. This narrow range results in a low standard deviation, indicating lower risk.
Stock B also has an average return of 8%, but its returns fluctuate between −5% and 20%. This wide range leads to a high standard deviation, indicating higher risk.
Investor Insight
Even if two stocks have the same average return, the one with the lower standard deviation is generally preferred by risk-averse investors because it offers more predictable performance.
Key Point to Remember
Standard deviation measures volatility. Higher standard deviation means higher risk, while lower standard deviation means more stable returns.
Standard Deviation
Meaning of Standard Deviation
Standard deviation is a statistical measure used to show how much an investment’s returns deviate from its expected or average return. It indicates the degree of dispersion of returns around the mean value.
Role in Investment Decisions
Standard deviation is widely used in investment analysis to measure historical volatility. It helps investors understand how stable or unstable an investment’s returns have been over time. The greater the deviation from the average return, the higher the uncertainty associated with the investment.
Interpretation of Risk
A stock with a high standard deviation experiences large fluctuations in returns, indicating higher volatility and higher risk. Conversely, a stock with a low standard deviation shows more consistent returns and is considered less risky.
Simple Example
Stock A has an average annual return of 8%. Over several years, its returns range between 6% and 10%. This narrow range results in a low standard deviation, indicating lower risk.
Stock B also has an average return of 8%, but its returns fluctuate between −5% and 20%. This wide range leads to a high standard deviation, indicating higher risk.
Investor Insight
Even if two stocks have the same average return, the one with the lower standard deviation is generally preferred by risk-averse investors because it offers more predictable performance.
Key Point to Remember
Standard deviation measures volatility. Higher standard deviation means higher risk, while lower standard deviation means more stable returns.
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