Tick data versus candle tests: what's the difference in results?

Testing on candles assumes one price per bar; tick data replays every price change. For intraday strategies the difference is large — fills inside a candle can change everything.

Have you compared?

• the strategy and the two test results
• where the candle test flattered the outcome
• whether tick testing changed your mind about the strategy

The bid, ask and slippage guide explains why intra-bar prices matter.