Mid-Parental Height Predictor implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-230

Effect

Computation or source lookup only

Input and validation requirements

The plain arithmetic formulas produce a numeric result for the exactly-zero parental-height boundary instead of inherently rejecting a physically invalid input, and extreme finite JavaScript inputs overflow to Infinity. Unspecified height units also permit materially divergent interpretations.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "father_height_cm": 180,
    "mother_height_cm": 165,
    "child_sex": "boy"
  },
  "expected_outputs": {
    "predicted_height_cm": 179,
    "range_cm": {
      "lower": 170.5,
      "upper": 187.5
    }
  },
  "working": "Sum parental heights: 180 + 165 = 345 cm. Add the boy adjustment: 345 + 13 = 358 cm. Divide by 2: 358 / 2 = 179 cm. Range: 179 − 8.5 = 170.5 cm; 179 + 8.5 = 187.5 cm."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json