Backtest Overfitting
Meaning ⎊ Excessive tuning of a strategy to past data, resulting in poor performance when applied to new market conditions.
Return Estimation Errors
Meaning ⎊ The variance between anticipated asset performance and actual market outcomes caused by flawed predictive modeling assumptions.
Data Snooping Bias
Meaning ⎊ The error of using future or repeated information during backtesting, leading to falsely optimistic performance results.
Backtesting Obsolescence
Meaning ⎊ The failure of historical data to accurately forecast future performance due to structural changes in market conditions.
Fat Tails in Returns
Meaning ⎊ The statistical phenomenon where extreme price movements occur more often than a normal distribution would predict.
