Description
Return a supplied detection-qualifier interval width and endpoint flags.
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.
Return a supplied detection-qualifier interval width and endpoint flags.
When to use this tool
Use Detection Qualifier Interval Width when checking the stated censoring, qualifier or reporting-denominator convention.
How to use the tool and how it works
- Enter lower, upper, lowerIncluded, upperIncluded. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read width, lowerClosed, upperClosed. Inspect lowerClosed, upperClosed before interpreting the associated values.
Return a supplied detection-qualifier interval width and endpoint flags. Require upper >= lower; zero width is accepted only with both endpoints included.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| lower | Lower | Required. Finite number. |
| upper | Upper | Required. Finite number. |
| lowerIncluded | Lower Included | Required. Boolean. |
| upperIncluded | Upper Included | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| width | Supplied interval span in matching measurement units, not statistical uncertainty. | Required. Finite number. |
| lowerClosed | Lower Closed | Required. Boolean. |
| upperClosed | Upper Closed | Required. Boolean. |
{
"input": {
"lower": 0,
"upper": 2,
"lowerIncluded": true,
"upperIncluded": false
},
"output": {
"width": 2,
"lowerClosed": true,
"upperClosed": false
}
}Limitations and assumptions
- These numeric interval records do not determine an assay detection limit, a biological threshold or a confidence interval.
- 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.
- Biomonitor Nondetect Closure Token
Check a nondetect label against a supplied limit policy.