Chart School / Thinking About Strategies & Risk
A hypothetical strategy framework
Lesson 13 of 14 · about 1 min read, plus practice · Glossary
A useful educational framework records a hypothesis, observable conditions, invalidation, a hypothetical outcome and a review. Specify the interval, the data available at each decision and what would count as failure before looking ahead. Separate the clarity of a rule from evidence that it works. Synthetic examples demonstrate mechanics, not profitability. Testing many rules and presenting only the winner can produce misleading results. A paper exercise leaves out execution, taxes, market impact and emotions.
Worked fictional example
A fictional worksheet asks whether River will stay above a $50 range after two closes above it. Invalidation is a later close below $50. Observations of $51, $52 and $48 meet the initial condition and then invalidate the hypothesis; no real trade is proposed.
On a small screen, scroll the chart horizontally to read every label.
Observation order / daily periods →
Accessible data table and chart description
Separate fictional daily OHLCV illustration for A hypothetical strategy framework. Hollow body: close at or above open; filled body: close below open. Table provides exact values.
| Date UTC | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| 2024-01-01 | 45 | 46 | 44 | 45 | 100 |
| 2024-01-02 | 45 | 51 | 44 | 50 | 120 |
| 2024-01-03 | 50 | 51 | 47 | 48 | 0 |
| 2024-01-04 | 48 | 52 | 47 | 51 | 160 |
| 2024-01-05 | 51 | 53 | 50 | 52 | 180 |
| 2024-01-06 | 52 | 53 | 47 | 48 | 200 |
Legend: hollow body = close ≥ open; filled blue body = close < open. Wick = low to high. Direction is also readable from the table, without color.
What could invalidate this interpretation?
A failure condition being met defeats this particular hypothesis even if a later unrelated rally occurs.
A counterexample
A profitable-looking example can result from choosing the rule after seeing all the prices. It does not validate a repeatable system.
Check your understanding
Further learning
Original FinanceFD explanations and drawings. For additional context, see Fidelity’s overview of technical analysis, Fidelity’s RSI guide and Investor.gov’s investing introduction.
Learning progress
Complete and sync all 32 lessons—18 Money Basics (beginner, intermediate, and expert across six topics) plus 14 Chart School—with one FinanceFD passkey account to earn a one-time 3-day Premium Membership trial. It does not require a payment method, start a charge, or renew automatically. If Premium is already active, the reward begins after that access ends. One reward per account.
If you are signed in to your FinanceFD passkey account, completed lesson IDs are saved there. Otherwise choose Sync with Passkey. Browser-only progress is merged only when you choose to sync; quiz answers and calculator entries are not saved. You can clear synced progress here.