Tool lesson

Backtest: Know What History Can Answer

A beginner-safe Backtest lesson for turning a trade idea into admissible evidence: hypothesis first, rulebook second, data window third, and result last.

13 minBeginner5 chapters

Educational only

The examples teach workflow and risk framing. They do not provide trade recommendations, personalized advice, leverage guidance, or guaranteed outcomes.

Chapter 01

Ask a question history can answer

Trader question

What question am I really asking history to answer?

A backtest can inspect how a defined rulebook behaved in a defined historical window. It cannot say what the next live trade will do, so the first skill is to write the question before looking at the chart.

Desk checklist

Name the market idea in plain language.
Keep the chart hidden until the assumptions are visible.
Write one thing the backtest cannot answer.

Interactive proof

Backtest workspace and result empty state

Use the courtroom lab to admit hypothesis, rulebook, data window, and result in the right order.

1HypothesisWhat market idea are you asking history to inspect?Plain language first: for example, pullbacks may recover better when the bigger trend is still positive.

2RulebookWhat exact entry, exit, stop, target, and filter rules were tested?A backtest judges rules, not vibes. If the rule changes after the result, it becomes a new case.

3Data windowWhich market, candle, date range, and capital assumption framed the evidence?The same idea can look different on 1M, 1Y, 3Y, MAX, or another metal.

4ResultWhat did this historical simulation show, and what can still invalidate it?A result can support more testing. It cannot approve the next live trade.

The Backtest lesson keeps the result last. Until the hypothesis, rulebook, and data window are visible, total return and win rate are not interpretable.

Interactive desk lab

Backtest Courtroom Lab

A practical first Backtest lab for admitting hypothesis, rulebook, data window, and result in the right order before reading a performance chart.

Native scroll

48s Remotion sceneBacktestCourtroomOrderVideo

Evidence before the chart

A trade idea enters the courtroom, then hypothesis, rulebook, data window, and result appear in the only order that makes the chart meaningful.

Storyboard beats4 cues

A vague trade idea lands on the desk.

Hypothesis, rulebook, and data window stamp in before the chart.

The result card appears only after assumptions are visible.

The final frame labels the result as evidence, not a forecast.

Remotion code

BacktestCourtroomOrderVideo

The snippet is stored with the lesson so a future Remotion project can render the chapter video.

Show component snippet

import {AbsoluteFill, Sequence} from "remotion";

const cards = ["Hypothesis", "Rulebook", "Data window", "Result"];

export const BacktestCourtroomOrderVideo = () => (
  <AbsoluteFill style={{background: "#fff8e8", color: "#071126", padding: 72}}>
    <h1>A result is admitted only after the assumptions.</h1>
    {cards.map((card, index) => (
      <Sequence key={card} from={index * 22}>
        <div style={{marginTop: 24, border: "1px solid #b69a5b", padding: 18}}>
          {index + 1}. {card}
        </div>
      </Sequence>
    ))}
  </AbsoluteFill>
);

Sources used for this tutorial

Backtesting and SimulationCFA InstituteUsed for the core framing that backtesting evaluates a strategy in a historical environment and should be supplemented with scenario and sensitivity work.Investment Model ValidationCFA Institute Research FoundationUsed to frame a backtest as model validation rather than proof that an idea will work live.The Probability of Backtest OverfittingBailey, Borwein, Lopez de Prado, ZhuUsed for the warning that repeated trials and parameter tuning can make in-sample results look better than future behavior.Investment Adviser MarketingSECUsed for fair-and-balanced language around hypothetical performance and limitations.NFA Interpretive Notice 9025National Futures AssociationUsed for futures-oriented caution that hypothetical performance can still be misleading if assumptions and limitations are not clear.

Next step

Open the tool with the checklist beside you.

Move from the lesson into the matching Bullion Brains tool, keep the checklist visible, and treat the output as evidence until the caveats are clear.

Open Strategy Backtester