Performance interpretation
Performance numbers are meaningless without context. Most bettors fail not because their strategies are bad, but because they misread the evidence.
The deception of raw data
Profit alone tells you almost nothing. A £50,000 return could signify a robust edge or an imminent collapse. Without understanding the mechanics of return, the number is just noise.
What the headline hides
ROI vs. volume
ROI is frequently abused. High ROI on low volume is marketing; low ROI on high volume is industrial power. Professional betting prioritises repeatability over excitement.
The strike rate trap
High strike rates are emotionally seductive but analytically weak. They often mask risk asymmetry. Markets don't pay for comfort, they pay for expectancy.
Same profit, different risk
Two systems can have identical profit and radically different risk profiles. You must look past the total to see the win/loss clustering and tail events.
Time under water
How long a system stays below peak equity (Time Under Water) matters more than the depth of the drawdown. Most systems fail during boredom, not panic. Long flat periods destroy confidence and invite dangerous over-optimisation.
Time under water
Illustration: the dashed line is peak equity. Every shaded stretch is time spent below it, which is where most systems are abandoned.
The price of returns
Drawdown is the price you pay for returns. If you cannot tolerate the worst historical drawdown, you should not trade the system.
| Metric | Professional interpretation |
|---|---|
| Maximum drawdown | A baseline for capital requirements and "worst-case" planning. |
| Typical drawdown | The day-to-day operational reality that determines survivability. |
| Recovery speed | A measure of system efficiency and edge stability. |
Where good results lie
Sample size warning
Small samples inflate confidence and hide structural weakness. Treat any conclusion drawn from a short dataset as provisional.
Scaling compression
As stakes increase, ROI often compresses. A scalable system trades margin for capacity. Ignoring market impact at scale is a fatal error.
Behavioural consistency
Consistency is not "winning every week." It is behavioural. It means similar risk exposure, predictable drawdown behaviour, and stable expectancy regardless of short-term outcomes.
The questions that matter
Professionals don't ask "Why didn't I win today?" They ask:
Sabotage through fixation
If you fixate on short-term results or compare your progress to marketing screenshots, you will sabotage even the best system. Growth is non-linear; expect plateaus and sudden accelerations.
- Is expectancy still intact based on market prices?
- Has the variance profile changed significantly?
- Is execution quality (slippage/fills) degrading?
- Are the underlying model assumptions still valid?
Read your results properly
An independent look at your performance: expectancy, variance, drawdowns and execution quality, read the way a professional reads them.