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Methodology
This page explains how the Performance Lab selects formulas, calculates results and communicates uncertainty.
Core principles
- A formula is used only if its purpose and limitations can be explained clearly.
- A result is never presented as more precise than the input data and the method allow.
- Measurement error and individual variation are not hidden.
- Calculators do not replace a diagnosis or individual professional advice.
- Practical usefulness matters as much as mathematical correctness.
Estimate confidence
Every calculator includes a rating of estimate confidence. It does not describe whether the mathematics was programmed correctly, but how well the method typically approximates an individual's real value.
What the levels mean
- High: The result follows directly from your inputs and is mathematically unambiguous. Deviations arise almost only from inaccurate inputs.
- Medium: The method is well established but works with average values. Individual variation can shift the actual result noticeably.
- Low: The method provides rough guidance. It is most useful for observing changes over time rather than for an exact single value.
How to work with estimates
An estimated value is a starting point, not a target. Observe your actual development under comparable conditions over several weeks, then adjust in small steps. Individual measurements fluctuate; trends are more meaningful.
Product guardrails
Some calculators and planners stop automatically before generating progressively lower or more aggressive targets. Those limits are conservative product decisions for a general-purpose tool — not universal medical safety thresholds and not individual medical clearance.
When a plan reaches such a guardrail, the correct interpretation is not 'everything up to this point is safe'. It means the Performance Lab will not generate a further automatic recommendation. Special health circumstances belong in professional care.