How to Catch Look-Ahead Bias When the Code Never Looks Ahead
With one setting enabled, the code knew at the open how the Nasdaq would close, turning a $69,000 loss into a $2.26 million gain.
Tag
Trading
8 articles tagged “Trading”.
Articles
Optimized or Overfit? How to Test Whether Your Best Parameters Were Just Lucky
Every optimization has a top result, even when the rule has no edge. Was yours just luck? Check neighbors, trade counts, out-of-sample data, and walk-forward tests.
Why Your Strategy Won't Place Orders: The Failures That Surface at the Broker
A compile, a backtest, and a paper trade can all come back clean. Order-handling failures that survive all three, and four checks that reach past them.
Sessions, Timezones and DST: Where Trading Code Quietly Breaks
Code that mentions a time is asking a clock. Which clock, what happens twice a year when two clocks disagree, and the checks that surface it.
"It Compiles" Is Not "It Works": What Compiling Actually Proves
A clean compile checks grammar, not meaning. What each platform's compiler really verifies, the failures it cannot see, and four checks that catch them.
Repainting Explained: How to Prove Whether Your Indicator Repaints
What repainting really is, five kinds worth separating, and three tests that prove whether your indicator or AI-generated strategy repaints.
8 Backtesting Pitfalls That Ruin Your Trading Strategies (and How to Avoid Them)
8 common backtesting pitfalls — look-ahead bias, survivorship bias, overfitting, and the back-adjusted futures data trap — and how to avoid each.
The best trading time frame
The best trading time frame is different for every trader. Find out how to pick the one that fits your style and schedule.