Mutual fund returns can change from one period to another due to market movements and portfolio factors. Standard deviation measures how much a fund's returns have varied around its average return over a specific period. A higher value indicates greater variation in historical returns, while a lower value indicates relatively smaller variation. This measure is commonly used alongside other risk indicators when analysing mutual funds. It helps investors understand the historical volatility of a fund and compare return fluctuations across different schemes.
What is Standard Deviation in Mutual Funds?
Standard deviation in mutual funds measures the extent to which a fund's periodic returns differed from its average return. It is a statistical measure of volatility. A higher standard deviation means the fund's historical returns have shown greater variation. A lower value means the returns have remained closer to their historical average.
For example, suppose two funds have similar average returns. If Fund A has a standard deviation of 5% and Fund B has 12%, Fund B has experienced greater historical return variation.
Standard deviation does not show whether the variation resulted in gains or losses. It only measures the extent of variation.
How is Standard Deviation Calculated?
Standard deviation is calculated by measuring how far each periodic return is from the average return. The general formula is:
Standard Deviation = √[Σ(Rᵢ − R̄)² / N]
Where:
- Rᵢ = Individual return
* R̄ = Average return
- N = Number of observations
The calculation involves finding the average return, measuring each return difference from that average, squaring those differences, and calculating their average. The square root of this value gives the standard deviation.
For mutual funds, the standard deviation can be calculated using daily, weekly, or monthly returns, depending on the methodology and measurement period.
How to Interpret Standard Deviation in Mutual Funds
Standard deviation should be interpreted in relation to the fund's category, investment strategy, and measurement period.
Low Standard Deviation
A lower standard deviation indicates that historical returns have shown relatively less variation around the average. This does not mean the fund has no risk. It only indicates lower historical return volatility based on the period measured.
High Standard Deviation
A higher standard deviation indicates greater historical variation in returns. Such funds may experience larger fluctuations in returns over the measurement period. Investors should consider this measure with the fund's investment objective and risk profile.
Standard Deviation Range Comparison
There is no universal standard deviation range that can classify every mutual fund as low or high risk. Different categories have different return patterns. For example, comparing the standard deviation of an equity fund directly with that of a liquid fund may not provide a meaningful assessment.
A more useful approach is to compare funds within the same category and over the same measurement period.
Where Can You Find a Mutual Fund's Standard Deviation?
Investors can find a mutual fund's standard deviation in fund factsheets, portfolio disclosures, and research platforms. However, comparisons should be made with caution, as the calculation period and methodology may vary across sources. To make a meaningful comparison, ensure that the standard deviation figures are based on similar time periods and calculation methods.
Why is Standard Deviation Important in Mutual Funds?
Standard deviation helps investors understand the historical volatility associated with a mutual fund. It can show whether a fund's returns have remained relatively stable or experienced wider fluctuations. This information can be useful when comparing funds with similar investment objectives.
However, standard deviation should not be treated as a standalone measure of investment risk. A fund with lower historical volatility can still face credit, market, interest rate, liquidity, or other risks.
How Can Investors Use Standard Deviation to Compare Mutual Funds?
Investors can use standard deviation as one factor when comparing mutual funds within the same category. A basic comparison can involve the following factors:
- Compare funds with similar investment objectives.
* Check standard deviation for the same measurement period.
- Compare standard deviation with historical returns.
* Review other risk measures alongside standard deviation.
- Consider the fund's portfolio and investment strategy.
For example, if two funds have similar historical returns, an investor may examine whether one has experienced greater return variation. Lower volatility may be associated with different portfolio characteristics or return patterns.
Limitations of Standard Deviation
Standard deviation has several limitations when used to assess mutual fund risk.
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Limitation
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What It Means
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Based on historical data
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Standard deviation uses past returns, which may not reflect future return patterns.
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Measures both positive and negative variation
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Both returns above and below the average contribute to the standard deviation.
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Depends on the measurement period
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Different periods or return frequencies can produce different standard deviation values.
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Does not capture all risks
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It does not fully reflect credit, liquidity, interest rate, concentration, or other fund-specific risks.
Conclusion
Standard deviation measures the historical variation in a mutual fund's returns from its average return. A higher value indicates greater historical volatility, while a lower value indicates smaller variation. The measure can help investors compare funds with similar investment objectives and understand their historical return patterns. However, it does not predict future performance or capture every type of investment risk. Investors should therefore consider standard deviation alongside other fund characteristics, risk measures, portfolio information, and investment objectives.
Frequently Asked Questions (FAQs)
What is a good standard deviation for a mutual fund?
There is no universally good standard deviation. Investors should compare the measure with similar funds in the same category and consider the fund's investment objective.
What does a high standard deviation indicate in mutual funds?
A high standard deviation indicates greater historical variation in a fund's returns around its average return during the measurement period.
Which mutual funds have lower standard deviation — equity or debt?
Debt funds generally have lower standard deviation than equity funds, although volatility varies across individual schemes and categories.
Can standard deviation predict future mutual fund returns?
No. Standard deviation measures historical return variation and does not predict future returns or guarantee a particular level of volatility.
Is standard deviation the only measure of risk in mutual funds?
No. Other measures include beta, Sharpe ratio, credit risk, liquidity risk, and portfolio-specific risks, depending on the mutual fund category.
How often should I check my mutual fund's standard deviation?
There is no fixed frequency. Investors can review it periodically, particularly when comparing funds or reassessing their portfolio.
What is standard deviation in mutual funds?
Standard deviation is a statistical measure showing how much a mutual fund's historical returns have varied around its average return.
Which mutual funds have lower standard deviation?
Funds with relatively stable historical returns generally have lower standard deviation. Comparisons should be made among funds within the same category.
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