A number never appears alone.
IQ Caddy preserves the source, population, year, method, uncertainty, and evidence status behind every value. The interface is designed to make unlike evidence look unlike.
Evidence statuses
Published directly by an authoritative assessment or statistical source.
Produced by an official source using a documented statistical model.
A researcher transformed or combined source measures in a reviewed publication.
A historical reconstruction based on biographies or ratings, not an administered test.
A number attributed to a person or publication without complete primary test documentation.
A claim contradicted, debunked, or unsupported by the reviewed evidence.
No defensible public value is available.
Score calculations
For a supplied score x, mean μ, and standard deviation σ, the standardized position is z = (x − μ) / σ. The displayed percentile is 100 × Φ(z), where Φ is the standard normal cumulative distribution. Directional upper-tail rarity uses the complementary error function to avoid precision loss in extreme tails.
These are theoretical normal-model conversions. They do not reproduce a publisher’s age-normed table, confidence interval, test ceiling, or score-report interpretation.
Comparison rules
- Measures, units, and assessment populations must match.
- Disputed claims cannot be used as comparison values.
- Unknown values cannot be sorted or ranked.
- Achievement data is never silently converted into IQ.
- Aggregate state and country records cannot describe individuals.
What “reviewed” means
A reviewed record has a traceable source, a documented license, an evidence classification, and written limitations. It does not imply endorsement by the source and does not guarantee that future evidence will not change the conclusion.