Better System Trader cover image

185: How to avoid creating trading strategies that degrade quickly - Timothy Masters

Better System Trader

00:00

Why Is Mary's Out-of-Sample Performance Now Biased?

For each of them, this performance on the most recent year is an unbiased measure of the quality of their system. It's unbiased because this data never went into their development process. But suppose you had decided in advance that you were going to trade Mary's system, even if John's was better. Her out-of-sample performance is now optimistically biased. How did that happen? The answer is that you are about to trade, in quotes, the better of John and Mary's system.

Transcript
Play full episode

The AI-powered Podcast Player

Save insights by tapping your headphones, chat with episodes, discover the best highlights - and more!
App store bannerPlay store banner
Get the app