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The statistics your backtest assumes you know.

How to read a decile plot, why one backtest isn't validation, and when a Sharpe ratio is just noise. The stats that separate a real edge from a curve fit, in trader language.

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Two equity curves from a $100k start: mid fills climb to $322,205 while the same trades through modeled fills end at $104,810.
FeaturedGuides

Options Backtesting: A Practical Guide for Systematic Traders

The same 0DTE iron condor, backtested twice: +222% with mid fills, +4.8% through a calibrated fill model. How to run an options backtest that doesn't flatter you — data, fills, margin, and validation.

Liam from Backtest.ai
FounderJul 2, 2026 · 12 min
Two nearly parallel equity curves from a $100k start under the tastytrade logo: mid fills end at $224,457, the fill model plus fees at $215,208.
Guides

tastytrade Backtesting, Tested: What It Does and Where It Breaks

9 min read
Four walk-forward folds stepping across 2019 to 2026, each a muted fit block followed by a bright test block, with the test blocks stitched into one out-of-sample record.
Guides

Walk-Forward Analysis: How to Validate and Optimize Trading Strategies

10 min read
3 posts
Two nearly parallel equity curves from a $100k start under the tastytrade logo: mid fills end at $224,457, the fill model plus fees at $215,208.
Guides

tastytrade Backtesting, Tested: What It Does and Where It Breaks

We tested tastytrade's free backtester: a fine first pass on whether a structure makes sense, blind to anything intraday. What it does, where it breaks, and the same backtest rerun with modeled fills.

Liam from Backtest.ai
Jul 7, 2026 · 9 min
Four walk-forward folds stepping across 2019 to 2026, each a muted fit block followed by a bright test block, with the test blocks stitched into one out-of-sample record.
Guides

Walk-Forward Analysis: How to Validate and Optimize Trading Strategies

Fit on one window, test on the unseen window after it, roll forward. What walk-forward analysis buys you over a single train/test split, and how to read a real fold table — including one that failed.

Liam from Backtest.ai
Jul 6, 2026 · 10 min
Two equity curves from a $100k start: mid fills climb to $322,205 while the same trades through modeled fills end at $104,810.
Guides

Options Backtesting: A Practical Guide for Systematic Traders

The same 0DTE iron condor, backtested twice: +222% with mid fills, +4.8% through a calibrated fill model. How to run an options backtest that doesn't flatter you — data, fills, margin, and validation.

Liam from Backtest.ai
Jul 2, 2026 · 12 min

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