# What Is the Difference between the Sharpe Ratio and the Sortino Ratio in Practice? ▴ Question

**Published:** 2025-08-17
**Categories:** Question

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## Concept

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## The Asymmetry of Perceived Risk

In any rigorous performance analysis, the conversation begins with a foundational premise ▴ return is inseparable from the risk undertaken to achieve it. An institutional framework for capital allocation is built upon quantifying this relationship with precision. The [Sharpe ratio](https://prime.greeks.live/question/how-does-the-sharpe-ratio-compare-to-the-sortino-ratio-in-volatile-markets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) has long served as a primary metric for this purpose, offering a standardized lens through which to view performance. It quantifies the excess return generated per unit of total [volatility](https://prime.greeks.live/area/volatility/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), treating every deviation from the mean ▴ whether positive or negative ▴ as an equal component of risk.

This approach provides a clean, comprehensive measure of volatility-adjusted returns, assuming a symmetrical distribution of those returns. It answers the question, “How much return did I receive for the overall price volatility I endured?”

However, the lived experience of an investor presents a fundamental asymmetry. Upside volatility, the sudden, sharp movements of a portfolio’s value in a positive direction, is rarely perceived as ‘risk.’ It is the source of outperformance. Downside volatility, conversely, represents the erosion of capital and the impairment of strategic goals. The [Sortino ratio](https://prime.greeks.live/question/how-does-the-sharpe-ratio-compare-to-the-sortino-ratio-in-volatile-markets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) is a direct response to this experiential reality.

It refines the measurement of risk by isolating and quantifying only the harmful, downside volatility. This metric recalibrates the definition of risk to align with the investor’s primary concern ▴ the potential for loss. The Sortino ratio specifically measures the excess return generated per unit of [downside deviation](https://prime.greeks.live/area/downside-deviation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), effectively ignoring upside volatility in its calculation of risk. This changes the fundamental question to, “How much return did I receive for the harmful volatility I was exposed to?”

> The core distinction lies in the definition of risk itself; Sharpe considers all volatility, while Sortino focuses exclusively on the volatility associated with negative returns.

This distinction is far from academic. It represents a critical divergence in how a [performance measurement](https://prime.greeks.live/area/performance-measurement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) system is architected. A system relying solely on the Sharpe ratio operates under a purely statistical definition of risk, where all deviations are mathematically equivalent. A system incorporating the Sortino ratio operates closer to a behavioral finance model, acknowledging that the impact of a -5% return is felt more acutely and has a different strategic implication than a +5% return.

For portfolios with non-normal or skewed return distributions ▴ common in alternative assets, hedge funds, and derivatives-based strategies ▴ this distinction becomes paramount. Strategies designed to capture significant upside while truncating downside, for instance, may be unduly penalized by the Sharpe ratio, which flags the positive volatility as a component of total risk. The Sortino ratio, in contrast, is engineered to recognize and correctly evaluate the performance of such asymmetric return profiles, offering a more precise instrument for manager selection and capital allocation in complex investment mandates.

![The abstract metallic sculpture represents an advanced RFQ protocol for institutional digital asset derivatives. Its intersecting planes symbolize high-fidelity execution and price discovery across complex multi-leg spread strategies](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-rfq-execution-microstructure-optimization.jpg)

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## Strategy

![A dynamic composition depicts an institutional-grade RFQ pipeline connecting a vast liquidity pool to a split circular element representing price discovery and implied volatility. This visual metaphor highlights the precision of an execution management system for digital asset derivatives via private quotation](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-pipeline-for-precise-price-discovery-and-volatility-surface-analysis.jpg)

## Calibrating the Lens for Asymmetric Outcomes

The strategic selection between the Sharpe and Sortino ratios is a function of the investment mandate’s specific risk architecture. For traditional, long-only equity or fixed-income portfolios that exhibit relatively normal return distributions, the Sharpe ratio often provides a sufficient and robust framework for performance evaluation. Its comprehensive view of volatility aligns well with strategies where risk is expected to be symmetrical.

In this context, the simplicity and widespread adoption of the Sharpe ratio make it an efficient tool for benchmarking and comparison. It provides a common language for evaluating managers and strategies within a universe of similarly structured portfolios.

The strategic imperative for the Sortino ratio emerges when the investment strategy is intentionally designed to produce [asymmetric returns](https://prime.greeks.live/area/asymmetric-returns/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). This is the domain of hedge funds, managed futures, and other alternative investment vehicles where the return profile is deliberately non-normal. Consider a tail-risk hedging strategy, which is characterized by long periods of small losses followed by infrequent but very large gains during market dislocations. The Sharpe ratio would penalize the positive volatility of those large gains, potentially making the strategy appear less effective than it is.

The Sortino ratio, by ignoring these positive spikes, provides a more accurate assessment of the strategy’s efficiency in generating returns relative to its [downside risk](https://prime.greeks.live/area/downside-risk/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite). This allows for a more intelligent allocation to diversifying strategies that may look unattractive through a traditional volatility lens.

> Employing the Sortino ratio is a strategic decision to measure performance against the risk of capital impairment, not just against statistical volatility.

Pension funds and endowments, with their long-term liabilities and acute sensitivity to drawdowns, represent another critical use case. For these institutions, the avoidance of significant losses is a primary objective. The Sortino ratio aligns the performance measurement framework directly with this drawdown-sensitive mandate. When evaluating potential fund managers, a pension fund can use the Sortino ratio to identify managers who have demonstrated an ability to generate returns without subjecting the portfolio to severe downside risk.

This is a subtle but profound shift. The evaluation moves from a general assessment of [risk-adjusted return](https://prime.greeks.live/area/risk-adjusted-return/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite) to a specific assessment of downside-risk-adjusted return, which is far more relevant to the institution’s solvency and long-term objectives.

![A high-fidelity institutional digital asset derivatives execution platform. A central conical hub signifies precise price discovery and aggregated inquiry for RFQ protocols](https://options.greeks.live/wp-content/uploads/2025/07/prime-os-rfq-protocol-high-fidelity-digital-asset-derivatives-execution-1.jpg)

## Comparative Signal Analysis under Different Market Conditions

To illuminate the strategic divergence, consider two hypothetical fund managers evaluated over the same period. Both achieve the same average annual return and the same overall [standard deviation](https://prime.greeks.live/guide/the-vwap-and-standard-deviation-system-for-consistent-options-income/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite), resulting in identical Sharpe ratios. However, Manager A achieves this through consistent, moderate gains, while Manager B’s returns are characterized by several large positive spikes and a number of small, controlled losses. The Sortino ratio would clearly differentiate these two.

Manager B, despite having the same total volatility as Manager A, would exhibit a much lower downside deviation and therefore a significantly higher Sortino ratio. For an investor whose primary concern is avoiding large losses, Manager B represents a more efficient use of their risk budget. The Sortino ratio provides the analytical tool to make this distinction visible and actionable.

### Hypothetical Manager Performance Comparison

| Metric | Manager A (Symmetrical Returns) | Manager B (Asymmetrical Returns) | Strategic Implication |
| --- | --- | --- | --- |
| Annualized Return | 10% | 10% | Both managers deliver the same top-line return. |
| Standard Deviation (Total Volatility) | 15% | 15% | Total risk appears identical. |
| Sharpe Ratio (assuming 2% risk-free rate) | 0.53 | 0.53 | Based on Sharpe, managers are indistinguishable. |
| Downside Deviation | 12% | 6% | Manager B demonstrates superior control of negative volatility. |
| Sortino Ratio (assuming 2% MAR) | 0.67 | 1.33 | Sortino reveals Manager B’s superior downside risk management. |

![Precision-engineered beige and teal conduits intersect against a dark void, symbolizing a Prime RFQ protocol interface. Transparent structural elements suggest multi-leg spread connectivity and high-fidelity execution pathways for institutional digital asset derivatives](https://options.greeks.live/wp-content/uploads/2025/07/insti-grade-digital-asset-derivatives-rfq-protocols-multi-leg-execution-junction.jpg)

![A sleek, multi-layered device, possibly a control knob, with cream, navy, and metallic accents, against a dark background. This represents a Prime RFQ interface for Institutional Digital Asset Derivatives](https://options.greeks.live/wp-content/uploads/2025/07/precision-control-interface-for-institutional-digital-asset-derivatives-rfq-protocols-and-prime-os.jpg)

## Execution

![Abstract forms on dark, a sphere balanced by intersecting planes. This signifies high-fidelity execution for institutional digital asset derivatives, embodying RFQ protocols and price discovery within a Prime RFQ](https://options.greeks.live/wp-content/uploads/2025/07/digital-asset-derivatives-rfq-platform-microstructure-execution-prime-os.jpg)

## Operationalizing Downside Deviation

The practical implementation of the Sortino ratio requires a more granular approach to data analysis than the Sharpe ratio. While the Sharpe ratio’s denominator ▴ standard deviation ▴ is a standard statistical function available in any analytical toolkit, the Sortino ratio’s denominator, downside deviation (or downside risk), requires a specific, multi-step calculation. This process is designed to isolate and measure only the periods of underperformance relative to a specified target.

The first step in this process is to define the Minimum Acceptable Return (MAR). This is a critical parameter. While it is often set to the risk-free rate to maintain consistency with the Sharpe ratio’s numerator, it can be set to zero or any other threshold that represents the investor’s minimum performance target. This flexibility allows the ratio to be tailored to specific investment objectives.

Once the MAR is established, the periodic returns of the portfolio are analyzed. For each period where the return falls below the MAR, the difference is recorded. All periods where the return meets or exceeds the MAR are assigned a value of zero. This step effectively filters out all positive or “acceptable” volatility from the data set.

> The execution of the Sortino ratio hinges on the precise calculation of downside deviation, a metric that quantifies only the volatility of underperformance.

The subsequent step involves calculating the standard deviation of these filtered negative returns. Specifically, the squared differences from the MAR for the underperforming periods are summed, the total is divided by the total number of periods (N), and the square root of this result is taken. This final number is the downside deviation.

It represents the volatility of the “bad” outcomes, providing a much more targeted measure of risk than the total standard deviation. While this calculation is more involved, it provides a level of insight that is indispensable for certain mandates.

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## A Step-By-Step Calculation Protocol

An operational protocol for calculating downside deviation involves a clear, sequential process. The integrity of the final Sortino ratio is entirely dependent on the rigor applied at this stage.

- **Data Aggregation** ▴ Compile a time series of portfolio returns (e.g. monthly or daily) over the desired evaluation period. A longer time series generally provides a more statistically significant result.

- **MAR Definition** ▴ Establish the Minimum Acceptable Return (MAR) per period. For example, if using monthly returns and an annualized risk-free rate of 3%, the monthly MAR would be approximately 0.25%.

- **Return Filtering** ▴ Create a new series of data points. For each period in the original time series, if the return is less than the MAR, the value in the new series is the difference (Return – MAR). If the return is greater than or equal to the MAR, the value is zero.

- **Squaring Deviations** ▴ Square each value in the new filtered series. This ensures all values are positive and gives greater weight to larger deviations.

- **Calculating the Mean** ▴ Calculate the average of these squared deviations. This is the downside variance.

- **Finalizing Downside Deviation** ▴ Take the square root of the downside variance. The result is the downside deviation, the denominator for the Sortino ratio.

### Illustrative Calculation of Downside Deviation (MAR = 0%)

| Period | Portfolio Return | Return Below MAR (0%) | Squared Deviation |
| --- | --- | --- | --- |
| 1 | +3% | 0 | 0 |
| 2 | -2% | -2% | 0.0004 |
| 3 | +5% | 0 | 0 |
| 4 | -1% | -1% | 0.0001 |
| 5 | +4% | 0 | 0 |
| 6 | -3% | -3% | 0.0009 |

This operational workflow highlights that while the Sortino ratio offers a more nuanced view of risk, it demands a higher level of computational diligence. It also introduces a potential point of contention ▴ the choice of the MAR. Different MARs can lead to different Sortino ratios and potentially different rankings of managers. Therefore, it is essential for institutions to establish a clear and consistent policy for the MAR to ensure that comparisons are meaningful and aligned with the overarching investment strategy.

Some analysts also point out a potential statistical limitation ▴ by focusing only on a subset of the data (the downside returns), the Sortino ratio can be less statistically robust than the Sharpe ratio, especially over shorter time horizons or with limited data points. This makes it a powerful complementary tool, often used alongside the Sharpe ratio, to build a comprehensive and resilient performance evaluation system.

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## References

- Sharpe, William F. “The Sharpe Ratio.” The Journal of Portfolio Management, vol. 21, no. 1, 1994, pp. 49-58.

- Sortino, Frank A. and Robert van der Meer. “Downside risk.” The Journal of Portfolio Management, vol. 17, no. 4, 1991, pp. 27-31.

- Kaplan, Paul D. and James A. Knowles. “Kappa ▴ A generalized downside risk-adjusted performance measure.” Journal of Performance Measurement, vol. 8, no. 2, 2004, pp. 42-54.

- Bacon, Carl R. Practical Portfolio Performance Measurement and Attribution. 2nd ed. Wiley, 2012.

- Ang, Andrew, and Geert Bekaert. “How regimes affect asset allocation.” Financial Analysts Journal, vol. 58, no. 2, 2002, pp. 86-99.

- Chaudhry, Anees, and Mehmood Nathani. “Sharpe Ratio and Sortino Ratio ▴ A Comparison.” SSRN Electronic Journal, 2017.

- Israelsen, Craig L. “A refinement to the Sharpe ratio and information ratio.” Journal of Asset Management, vol. 5, no. 6, 2005, pp. 423-427.

![Abstract forms illustrate a Prime RFQ platform's intricate market microstructure. Transparent layers depict deep liquidity pools and RFQ protocols](https://options.greeks.live/wp-content/uploads/2025/07/high-fidelity-rfq-for-institutional-digital-asset-derivatives-primeos.jpg)

## Reflection

![Abstract clear and teal geometric forms, including a central lens, intersect a reflective metallic surface on black. This embodies market microstructure precision, algorithmic trading for institutional digital asset derivatives](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-protocol-execution-prime-os.jpg)

## Beyond Ratios a Systemic View of Risk

The choice between these two ratios is ultimately a choice about the philosophy of risk measurement that underpins an entire investment operation. Selecting a metric is an architectural decision. It defines how performance is translated into data, how data informs decisions, and how those decisions compound over time. Is risk a purely statistical phenomenon, a symmetrical dispersion around a central tendency?

Or is it an experiential one, defined by the potential for capital impairment? The answer to that question determines which lens is appropriate. A truly robust analytical framework may find that the most resilient system utilizes both, leveraging the Sharpe ratio for its breadth and universal comparability, while deploying the Sortino ratio for its depth and alignment with the acute realities of loss aversion. The ultimate objective is to construct a system of intelligence that sees the full spectrum of performance, not just the part that fits a convenient statistical model.

![Curved, segmented surfaces in blue, beige, and teal, with a transparent cylindrical element against a dark background. This abstractly depicts volatility surfaces and market microstructure, facilitating high-fidelity execution via RFQ protocols for digital asset derivatives, enabling price discovery and revealing latent liquidity for institutional trading](https://options.greeks.live/wp-content/uploads/2025/07/optimized-rfq-protocol-dynamics-for-institutional-crypto-derivatives.jpg)

## Glossary

<a href="https://prime.greeks.live/question/how-does-the-sharpe-ratio-compare-to-the-sortino-ratio-in-volatile-markets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Sharpe Ratio

The Sortino ratio refines risk analysis by isolating downside volatility, offering a clearer performance signal in asymmetric markets than the Sharpe ratio. </a><a href="https://prime.greeks.live/area/volatility/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Volatility

Meaning ▴ Volatility quantifies the statistical dispersion of returns for a financial instrument or market index over a specified period. </a><a href="https://prime.greeks.live/question/how-does-the-sharpe-ratio-compare-to-the-sortino-ratio-in-volatile-markets/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
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## Sortino Ratio

The Sortino ratio refines risk analysis by isolating downside volatility, offering a clearer performance signal in asymmetric markets than the Sharpe ratio. </a><a href="https://prime.greeks.live/area/downside-deviation/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![Translucent teal glass pyramid and flat pane, geometrically aligned on a dark base, symbolize market microstructure and price discovery within RFQ protocols for institutional digital asset derivatives. This visualizes multi-leg spread construction, high-fidelity execution via a Principal's operational framework, ensuring atomic settlement for latent liquidity](https://options.greeks.live/wp-content/uploads/2025/07/transparent-geometric-structures-visualizing-multi-leg-spread-rfq-protocols-for-high-fidelity-institutional-digital-asset-derivatives-execution.jpg)

## Downside Deviation

Meaning ▴ Downside Deviation quantifies the volatility of returns that fall below a specific minimum acceptable return, often referred to as the hurdle rate or target return. </a><a href="https://prime.greeks.live/area/performance-measurement/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A cutaway view reveals the intricate core of an institutional-grade digital asset derivatives execution engine. The central price discovery aperture, flanked by pre-trade analytics layers, represents high-fidelity execution capabilities for multi-leg spread and private quotation via RFQ protocols for Bitcoin options](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-prime-os-rfq-protocol-engine-for-high-fidelity-execution-and-price-discovery-on-volatility-surface.jpg)

## Performance Measurement

Meaning ▴ Performance Measurement defines the systematic quantification and evaluation of outcomes derived from trading activities and investment strategies, specifically within the complex domain of institutional digital asset derivatives. </a><a href="https://prime.greeks.live/area/asymmetric-returns/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![Sleek, speckled metallic fin extends from a layered base towards a light teal sphere. This depicts Prime RFQ facilitating digital asset derivatives trading](https://options.greeks.live/wp-content/uploads/2025/07/prime-os-digital-asset-derivatives-rfq-high-fidelity-execution-intelligence.jpg)

## Asymmetric Returns

Meaning ▴ Asymmetric returns describe a financial outcome where potential gains significantly outweigh potential losses, or conversely, from a given market position or strategy. </a><a href="https://prime.greeks.live/area/downside-risk/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A precision algorithmic core with layered rings on a reflective surface signifies high-fidelity execution for institutional digital asset derivatives. It optimizes RFQ protocols for price discovery, channeling dark liquidity within a robust Prime RFQ for capital efficiency](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-rfq-engine-optimized-for-precision.jpg)

## Downside Risk

Meaning ▴ Downside risk quantifies the potential for an asset's value to decline, specifically measuring the magnitude of expected losses within a defined confidence interval over a specified holding period, reflecting exposure to adverse market movements in institutional digital asset derivatives. </a><a href="https://prime.greeks.live/area/risk-adjusted-return/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A precision-engineered blue mechanism, symbolizing a high-fidelity execution engine, emerges from a rounded, light-colored liquidity pool component, encased within a sleek teal institutional-grade shell. This represents a Principal's operational framework for digital asset derivatives, demonstrating algorithmic trading logic and smart order routing for block trades via RFQ protocols, ensuring atomic settlement](https://options.greeks.live/wp-content/uploads/2025/07/institutional-crypto-derivatives-os-core-algorithmic-execution-engine.jpg)

## Risk-Adjusted Return

Meaning ▴ Risk-Adjusted Return quantifies the efficiency of capital deployment by evaluating the incremental return generated per unit of systemic or idiosyncratic risk assumed, providing a standardized metric for performance comparison across diverse investment vehicles and strategies. </a><a href="https://prime.greeks.live/guide/the-vwap-and-standard-deviation-system-for-consistent-options-income/?utm_source=options.greeks.live&utm_medium=referral&utm_campaign=satellite" class="glossary-item-box">
![A dark blue sphere and teal-hued circular elements on a segmented surface, bisected by a diagonal line. This visualizes institutional block trade aggregation, algorithmic price discovery, and high-fidelity execution within a Principal's Prime RFQ, optimizing capital efficiency and mitigating counterparty risk for digital asset derivatives and multi-leg spreads](https://options.greeks.live/wp-content/uploads/2025/07/market-microstructure-driven-institutional-digital-asset-derivatives-rfq.jpg)

## Standard Deviation

A systematic guide to generating options income by targeting statistically significant price deviations from the VWAP. </a>

**Tags:** [Risk-Adjusted Return](https://options.greeks.live/area/risk-adjusted-return/), [Hedge Fund Analysis](https://options.greeks.live/area/hedge-fund-analysis/), [Drawdown Control](https://options.greeks.live/area/drawdown-control/), [Performance Measurement](https://options.greeks.live/area/performance-measurement/), [Asymmetric Returns](https://options.greeks.live/area/asymmetric-returns/), [Downside Deviation](https://options.greeks.live/area/downside-deviation/)	

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### [The RFQ Advantage Secure Better Prices for Your Crypto Trades](https://options.greeks.live/guide/the-rfq-advantage-secure-better-prices-for-your-crypto-trades/)
![Two distinct modules, symbolizing institutional trading entities, are robustly interconnected by blue data conduits and intricate internal circuitry. This visualizes a Crypto Derivatives OS facilitating private quotation via RFQ protocol, enabling high-fidelity execution of block trades for atomic settlement.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-digital-asset-derivatives-prime-os-engine-interconnect-for-optimal-rfq-execution.jpg)

Command your execution with RFQ and secure institutional-grade pricing for your crypto trades.

- 
### [Why Professional Traders Hedge with Precision Collars](https://options.greeks.live/guide/why-professional-traders-hedge-with-precision-collars/)
![Polished metallic pipes intersect via robust fasteners, set against a dark background. This symbolizes intricate Market Microstructure, RFQ Protocols, and Multi-Leg Spread execution. It highlights High-Fidelity Execution, Atomic Settlement, and Capital Efficiency within a Principal's Operational Framework for Digital Asset Derivatives.](https://options.greeks.live/wp-content/uploads/2025/07/precision-engineered-metallic-nodes-illustrating-rfq-protocols-for-multi-leg-digital-asset-derivatives-institutional-execution.jpg)

Master the art of the precision collar to define your risk, protect your gains, and command your financial future.

- 
### [Bitcoin Holds Strong Amidst Profit-Taking, ‘Uptober’ Sentiment Endures](https://options.greeks.live/news/bitcoin-holds-strong-amidst-profit-taking-uptober-sentiment-endures/)
![A precisely engineered multi-component structure, split to reveal its granular core, symbolizes the complex market microstructure of institutional digital asset derivatives. This visual metaphor represents the unbundling of multi-leg spreads, facilitating transparent price discovery and high-fidelity execution via RFQ protocols within a Principal's operational framework.](https://options.greeks.live/wp-content/uploads/2025/07/institutional-grade-digital-asset-derivatives-rfq-protocols-revealing-market-microstructure-for-high-fidelity-execution-and-atomic-settlement-within-principals-operational-framework.jpg)

Despite short-term profit-taking, Bitcoin's underlying market structure remains robust, indicating sustained institutional interest and a resilient price trajectory.

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---

**Original URL:** https://options.greeks.live/question/what-is-the-difference-between-the-sharpe-ratio-and-the-sortino-ratio-in-practice/
