What Is Standard Deviation of Returns?
Standard deviation measures how much your per-trade results scatter around their average. It is the raw 'volatility' that risk-adjusted ratios like Sharpe and Sortino are built on.
Standard deviation of returns measures how spread out your trade results are around their average. Tracktions computes it on your per-trade R-multiples, so a low number means your trades land close to the average and a high number means they swing wildly from big wins to big losses.
Why it matters
Two systems can share the same average R yet feel completely different to trade. One delivers a steady drip of small wins and losses; the other lurches between +5R and −4R. The second has a higher standard deviation — more volatility — and is far harder to size and sit through, even though the average is identical.
A worked example
| System | Results | Average | Spread |
|---|---|---|---|
| Steady | +1R, +1R, −1R, +1R | +0.5R | Low |
| Swingy | +5R, −4R, +5R, −4R | +0.5R | High |
Same +0.5R average, very different experience. Standard deviation is the number that tells them apart.
How to use it
- It is the denominator of risk-adjusted ratios — the Sharpe and SQN scores divide your edge by this spread, rewarding consistency.
- Lower is usually calmer — steadier results are easier to size with confidence and survive psychologically.
- Downside-only cousin — if you only want to penalise harmful volatility and ignore big upside swings, look at downside deviation, which powers the Sortino ratio.
Educational content only. Tracktions is a trade-journaling and analytics tool, not investment advice — we are not SEBI-registered advisers and do not provide trade recommendations, tips, or assurances of returns.