What Forex charts show, and why evaluation matters
Forex charts are visual representations of price over time for currency pairs. “Price over time” depends on choices such as the timeframe (e.g., 1-minute vs. 1-hour candles), the quoted price type (bid/ask/mid), and the data source (broker feed vs. an exchange-like reference). When you evaluate a chart, your goal is not to find certainty—it is to verify that the chart’s inputs match the question you are trying to answer.
A reliable evaluation separates stable mechanics (how chart data and candle construction work) from variable conditions (market liquidity at that moment, execution costs, or differences between providers). If those inputs are unclear, conclusions become difficult to reproduce.
Mechanics checklist: validate the chart’s inputs
Use a “read the data before reading the story” approach:
- Timeframe and candle type: Confirm which timeframe you are viewing and what each candle represents (open/high/low/close for that interval). If you switch timeframes, the same market action can look different.
- Price definition: Determine whether the chart is based on bid, ask, or mid (average) pricing. This matters because many trading outcomes react to executable prices, not the midpoint shown by some charting tools.
- Data source and continuity: Check whether the chart is using a single feed consistently or mixing data. Look for gaps, jumps, or unusual spikes that can indicate missing data or source differences.
- Contract/Instrument mapping: Ensure the currency pair symbol corresponds to the same instrument across charts you compare. Small naming differences can conceal different feeds or contract specifications.
- Indicator calculation rules: If the chart includes indicators, confirm the calculation inputs (e.g., moving average window length, whether values are based on closing price, how volume is handled). An indicator is a transformation, not new information.
Evidence and example: how to test whether chart patterns are reproducible
A basic evidence test is reproducibility across contexts without assuming future performance:
- Pick a specific visual claim you might be tempted to rely on (for example, “a move after a breakout”).
- Re-check it on multiple timeframes to see whether the same event meaningfully aligns with the same dates/times.
- Compare the same time window across two data sources (if available) to see whether key levels and timing remain consistent.
- Write down assumptions for any quick calculation you do. For example, if you measure a “range,” specify whether you measure high-to-low of a candle interval, close-to-close, or another definition.
If the observation disappears when you adjust the timeframe, data source, or the price definition, it is a rode vlag that the “pattern” may be an artifact of the chart settings rather than a stable market behavior.
Limitations and risks: common failure modes
Even with correct mechanics, several limitations can break naive interpretations:
- Historical relationships are not predictive. Past structure can fail under different market conditions.
- Execution and costs can dominate results. Charts may omit spreads, slippage, and financing costs; these affect what actually happens when you execute.
- Provider differences can shift visuals. Two charts can show different highs/lows for the “same moment” because of bid/ask choice, feed timing, or data processing.
- Regime change can invalidate comparisons. Volatility and liquidity can change, making prior ranges behave differently.
- Missing or adjusted data can distort backtests or visual checks. Data gaps, corporate actions analogs (where relevant), or provider-specific adjustments can alter what the chart shows.
Verification and next questions: a clear “ready to use” criterion
A chart evaluation is “done” when you can answer these ready-to-verify questions:
- AFVinkpunten: Can you state the timeframe, price definition, and data source used by the chart?
- Bewijs/document: If the chart comes from a platform, can you point to documentation that explains how candles and indicators are calculated?
- Rode vlaggen: Did you observe gaps, timing inconsistencies, or obvious mismatches when comparing sources?
- Klaarcriterium: Would another person see the same candles for the same period if they used the same settings and data source?
If you cannot meet these criteria, treat any interpretation as uncertain and focused on learning chart behavior rather than expecting consistent real-world outcomes.