Lesson Context Market Feed
SPY $746.20 +0.47%
QQQ $719.30 +0.67%
AAPL $309.62 +1.52%
MSFT $418.28 -0.19%
NVDA $217.16 -1.07%
XLK $180.82 +1.24%
Core Concepts

How to use the engine like a filter instead of a marketing tool

The fastest path to better deployment is learning to reject more strategies earlier.

Workflow Primary output: Reject or advance Best habit: Test ugly periods Screen: Backtesting Engine
Key Takeaways What to take from this lesson
Lock the strategy before the run Run broad enough scenarios
Risk Frame Backtesting trap to avoid
  • Do not tune until the bad period disappears.
  • Do not compare systems with incompatible capital assumptions.
  • Do not treat one high-performing run as robust evidence.
Step 01

Lock the strategy before the run

Freeze the logic and capital assumptions before you inspect performance so the test reflects the original thesis instead of a moving target.

Step 02

Run broad enough scenarios

Test multiple periods, symbols, and market states to see whether the system's behavior survives outside the one obvious window.

Step 03

Review stress, not just summary stats

Drawdown duration, loss clustering, and recovery quality usually matter more operationally than the headline return number.

Step 04

Decide pass, revise, or kill

A clean workflow ends with an explicit decision. Strategies that stay forever in maybe-mode consume time and add noise to the desk.