Support Board
Date/Time: Sat, 14 Feb 2026 14:01:20 +0000
Post From: Inconsistency in replay mode backtests?
| [2026-02-14 05:56:30] |
| RefillsFree - Posts: 2 |
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I have been working on an ASCIL script, and replaying the script on Sim accounts on Sierra to then backtest and collect trace activity data. My problem is that I will run the script on a set time, then run the script again, same start time, same duration, same instance of Sierra, same computer, yet I will get slightly different results, up to around 15% PnL deviation. My script runs intrabar. The script follows the same logic I want it to, but the entries and exits are slightly different, and often the trade count varies by a small amount. What multiple runs of the script would look like on a PnL graph would be very similar lines, yet they slowly diverge over time to produce different ending balances. Is this more likely a Sierra Chart error, code error, or something else? Has anyone else had this problem and solved it? Any tips? I'm very open to working together to solve this! If I left out any details pls ask. I attached the profit graphs of 5 of my backtests, same script, same computer, same start and end time, no changed settings. |
 Screenshot 2026-02-14 005417.png / V - Attached On 2026-02-14 05:54:42 UTC - Size: 172.37 KB - 6 views |