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Chart vs Spreadsheet: How to Test the Interface Fairly

Research protocol · Reviewed 24 Aug 2026

Candles are one representation of price; a table is another. A fair experiment asks which representation supports a defined decision task while keeping the underlying information and historical sample equivalent.

The result describes the tested user, task, and interface. It should not be generalized to every trader or used as evidence that visual analysis is inherently biased.

Change the representation, keep the information

FIELD 04

A chartless test must define exactly what the table reveals

A spreadsheet can reduce visual pattern cues, but it can also remove legitimate information such as range, sequence, time spacing, and spread. The useful experiment is not “eyes versus numbers”; it is a comparison of two specified interfaces that expose an equivalent information set.

Randomize the assigned interface across matched historical tasks, preserve bid and ask where execution matters, and measure decision quality before profit. Time to decision, rule adherence, data-entry errors, confidence calibration, and skipped fields can explain why an interface changes behaviour.

Information parity

Decide whether each interface shows OHLC, timestamp, volume, bid-ask spread, prior bars, and indicators. A missing variable is a treatment difference.

Learning effect

Alternate or randomize interface order. Doing every chart trial first lets practice masquerade as a spreadsheet effect.

Primary outcome

Rule adherence and decision error are more direct interface measures than short-run P&L, which depends heavily on the chosen historical segment.

  1. Use the same tasks, rules, risk, and review form in both interfaces.
  2. Log latency, revisions, omissions, and confidence before the result.
  3. Blind future rows and prevent accidental look-ahead.
  4. Report user-specific findings without claiming a universal interface winner.

Removing the picture is informative only when the underlying market information remains comparable.

Separate interface from testing method

Specify both information sets

List every field visible in the chart and table: timestamp, OHLC or bid-ask values, lookback depth, session markers, volume, indicators, and order state. Hide future rows and future candles with the same rule.

Counterbalance the task order

Create matched historical tasks, then alternate or randomize which interface is used first. Keep strategy instructions, risk, and journal fields fixed. Record decision time, changed decisions, entry errors, omitted checks, and confidence before revealing outcomes.

Interpret process before P&L

Compare adherence, calibration, and error types first; summarize P&L cautiously with its sample path and costs. Repeat on another period and disclose familiarity with each interface. A preference is useful, but it is not a universal performance law.

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