Most traders judge a signal by whether the last trade made money. That's like rating a restaurant based purely on one visit during a kitchen staff shortage. It tells you almost nothing useful. A single good or bad result is just noise dressed up as information — and acting on it is how perfectly decent systems get abandoned too early or trusted too long.
A signal quality scorecard changes that. Instead of one metric deciding a signal's fate, you combine several independent measures into a composite score. The direct answer: build your scorecard around three pillars — Sharpe ratio for risk-adjusted return, drawdown consistency for behavioural reliability, and fill rate for real-world executability. Together they tell you whether a signal is genuinely worth trading, not just occasionally lucky.
Think of each pillar as a different mechanic inspecting the same car. Sharpe ratio checks the engine — are returns worth the volatility required to generate them? A signal producing a 0.8 Sharpe over 200 trades is telling you something real. Drawdown consistency checks the suspension — does the signal behave predictably under stress, or does it occasionally blow out in ways the average drawdown figure hides?
Fill rate is the mechanic checking the tyres — a signal that looks brilliant in backtesting but only fills 40% of intended trades in live markets is quietly destroying your edge before you even notice. A composite scorecard assigns each pillar a normalised score out of ten, weights them according to your strategy's priorities, then produces a single actionable rating. High-frequency strategies might weight fill rate most heavily; longer-timeframe systems might favour drawdown consistency. For deeper grounding on the maths, the Sharpe ratio methodology on Investopedia is worth bookmarking, and the Wikipedia entry on drawdown in economics clarifies exactly what consistency metrics should measure. For a broader framework on performance attribution, Investopedia's signal overview ties it together neatly.
Build your scorecard in a simple spreadsheet first. Track each metric over a rolling 50-trade window and flag any pillar that drops below 6/10 — that's your early warning system.
A signal without a scorecard is just a hunch with good marketing — measure it or don't trade it.
This content is for educational purposes only and does not constitute financial product advice. Past performance is not indicative of future results. Profit Logic Ltd (ACN 688 669 936) accepts no responsibility for errors or omissions in this content or anywhere on this website. Always seek advice from a licensed financial adviser before making investment decisions.