Vanadyr Research https://vanadyr.com/research Notes on systematic investing operations: research, validation, deployment and reconciliation. en-gb Why your backtest doesn't match live trading https://vanadyr.com/research/why-your-backtest-doesnt-match-live-trading https://vanadyr.com/research/why-your-backtest-doesnt-match-live-trading Fri, 25 Sep 2026 09:00:00 GMT Seven reasons results drift between a backtest and a live or paper run, one worked example, and what an operating process that catches the drift looks like.