Description
Check a nondetect label against a supplied limit policy.
A censored analytical result provides a bound rather than a quantified concentration. Missing results, left-censoring, right-censoring and endpoint inclusion are different states; a reporting share or interval-width check does not select a detection limit or recover unobserved values.
Check a nondetect label against a supplied limit policy.
When to use this tool
Use Biomonitor Nondetect Closure Token when checking the stated censoring, qualifier or reporting-denominator convention.
How to use the tool and how it works
- Enter value, limit, nondetect, includeLimit. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read consistentUnderRule, upperBounded, upperBound. Inspect consistentUnderRule, upperBounded before interpreting the associated values.
Check a nondetect label against a supplied limit policy. consistentUnderRule is true when not nondetect, otherwise value <= limit when inclusive or value < limit; upperBound is limit only when nondetect, zero otherwise.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| value | Value | Required. Finite number. |
| limit | Limit | Required. Finite number. |
| nondetect | Nondetect | Required. Boolean. |
| includeLimit | Include Limit | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| consistentUnderRule | Consistent Under Rule | Required. Boolean. |
| upperBounded | Upper Bounded | Required. Boolean. |
| upperBound | Supplied limit only when nondetect; zero placeholder otherwise. | Required. Finite number. |
{
"input": {
"value": 5,
"limit": 5,
"nondetect": true,
"includeLimit": false
},
"output": {
"consistentUnderRule": false,
"upperBounded": true,
"upperBound": 5
}
}Limitations and assumptions
- Zero upperBound without upperBounded is a placeholder; this does not quantify a nondetect or choose a valid detection limit.
- 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
Retain the original qualifier and method-specific detection/reporting definitions; use an appropriate censored-data analysis for estimates or uncertainty.
References
Similar or alternative tools
- Biomonitoring Research Below Limit Share
Return measured and left-censored shares under a missing-data policy.
- Detection Qualifier Interval Width
Return a supplied detection-qualifier interval width and endpoint flags.