Description
Apply a biometric threshold tie policy.
Biometric scores depend on matcher version, score direction, acquisition handling and an explicit operating threshold. Score transformations and observed error fractions are different from identity verification; equality, quantization and excluded attempts can change the local reported result.
Apply a biometric threshold tie policy.
When to use this tool
Use Biometric Threshold Tie Policy when checking the stated biometric score, threshold, reporting precision or error-denominator convention.
How to use the tool and how it works
- Enter score, threshold, higherMatches, acceptTie. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read accepted, tie, margin. Inspect accepted, tie before interpreting the associated values.
Apply a biometric threshold tie policy. Exact score equality follows acceptTie; otherwise higherMatches selects comparison direction; return accepted, tie and oriented margin.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| score | Score | Required. Finite number. |
| threshold | Threshold | Required. Finite number. |
| higherMatches | Higher Matches | Required. Boolean. |
| acceptTie | Accept Tie | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| accepted | Accepted | Required. Boolean. |
| tie | Tie | Required. Boolean. |
| margin | Margin | Required. Finite number. |
{
"input": {
"score": 0.7,
"threshold": 0.7,
"higherMatches": true,
"acceptTie": false
},
"output": {
"accepted": false,
"tie": true,
"margin": 0
}
}Limitations and assumptions
- This evaluates supplied numbers only, without authentication, model calibration or a suitable operational threshold.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Evaluate a validated matcher on relevant complete data with explicit acquisition/exclusion and threshold policies; assess uncertainty, privacy and fairness independently.
References
Similar or alternative tools
- Match Score Margin To Threshold
Return score margin and a supplied threshold decision.
- Verification Threshold Equality Flag
Return a biometric score decision with explicit equality and direction.