https://ohlcv.io/tags/data-quality/Quant trading research and writingHugoen-auWed, 27 May 2026 23:43:46 +1000https://ohlcv.io/posts/backtesting-pitfalls/02-data-quality/Mon, 02 Feb 2026 00:00:00 +1100https://ohlcv.io/posts/backtesting-pitfalls/02-data-quality/A backtest is only as reliable as the data on which it is built, and the quality of freely available and even commercially distributed historical market data is far worse than most traders realise.