Mystery Chart Bias Test
Hide asset identities to read price action without narrative bias
- Difficulty
- Easy
- Time to result
- ~days to results
- Steps
- 5
- Confidence
- 97%
The Mystery Chart Bias Test separates observable price behavior from everything an investor thinks they know about an asset. First, remove the chart title and other identifying details while preserving the price pattern and relevant technical characteristics. Evaluate the anonymous setup and record a directional judgment before revealing the name. Then compare that blind assessment with the reaction produced by the asset's identity. A large change signals that reputation, prior positions, headlines, or personal preferences may be overriding the evidence. The method does not prove that the chart is correct or replace fundamental analysis. Instead, it creates a controlled comparison between an evidence-first reading and a story-influenced reading, helping analysts identify where bias enters their process.
Origin
John Roque used mystery charts in sell-side reports, offering lunch to the first client who identified the hidden asset. He found that removing titles helped people make more objective decisions.
Core principles
- 01Asset names trigger stories and emotional commitments
- 02Price structure can be evaluated independently of identity
- 03A blind judgment exposes conflicts between evidence and prior beliefs
- 04Revealing the asset after analysis creates a useful bias check
How to run it
- 1
Anonymize the chart
Remove the asset name, ticker, company branding, and other clues while retaining the relevant price history and technical indicators.
Pro tip Ask another person to prepare the chart so you cannot infer the identity from the file or presentation context.
Watch out Do not alter the scale or time period in a way that changes the apparent pattern.
- 2
Describe only what is visible
Write down the trend, momentum, support, resistance, relative strength, and other observable characteristics without constructing a business narrative.
Pro tip Use a standard template so every anonymous chart receives the same analysis.
Watch out Avoid guessing the asset's identity, because that reintroduces the bias the exercise is meant to remove.
- 3
Make a blind classification
Classify the setup as bullish, bearish, or neutral and state what evidence would invalidate that judgment.
Pro tip Record the answer before any group discussion.
Watch out Do not leave the conclusion vague merely to avoid being wrong.
- 4
Reveal the identity
Restore the title and note your immediate emotional and analytical response to the asset.
Pro tip Pay attention to reactions such as disbelief, excitement, or dismissal.
Watch out Do not silently rewrite the original judgment after seeing the name.
- 5
Reconcile the difference
Compare the blind conclusion with the identified-asset conclusion and investigate any discrepancy before making a decision.
Pro tip Ask which new asset-specific fact genuinely changes the analysis.
Watch out A blind chart reading is a bias diagnostic, not a complete investment thesis.
In the wild
An investment team rejects a company whenever its name appears because members dislike its industry. An anonymized chart is independently rated as a strong uptrend with improving relative strength. After the reveal, the team documents its objections and distinguishes genuine fundamental risks from reflexive dislike before deciding whether to investigate further.
→ The team identifies its narrative bias and gives the evidence a fair review without automatically buying the stock.
Common mistakes
Using the test as a buy signal
An attractive anonymous chart is only evidence about price behavior. Fundamental, portfolio, and risk constraints still require evaluation.
Leaving identifying clues visible
Sector labels, distinctive dates, annotations, or recognizable price levels can reveal the asset and defeat the exercise.
Changing the blind answer afterward
Rewriting the initial judgment hides the very discrepancy the method is designed to surface.
Is it for you?
Best for
It is best for analysts and investment teams evaluating familiar, controversial, or emotionally charged assets.
Not ideal for
It is not ideal when the decision depends primarily on asset-specific fundamentals, liquidity constraints, or imminent events.
From the transcript
“I would put the chart, I would put the technical characteristics of it, but I would take the title off of it.”
“And I think when people saw it without the title, they made a more objective decision than when they saw it with the title.”
“if we remove our biases, we can actually pick up some important information.”
From the episode
Interview With John Roque: Masters in Business (Audio)
John Roque