Description
Return measured and left-censored shares under a missing-data 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.
Return measured and left-censored shares under a missing-data policy.
When to use this tool
Use Biomonitoring Research Below Limit Share when checking the stated censoring, qualifier or reporting-denominator convention.
How to use the tool and how it works
- Enter measured, leftCensored, rightCensored, missing, includeMissing. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read denominator, belowShare, measuredShare. Use the output convention below.
Return measured and left-censored shares under a missing-data policy. Require nonnegative whole counts and measured+leftCensored+rightCensored > 0; denominator adds missing only when includeMissing, shares divide measured and left-censored counts by that base.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| measured | Measured | Required. Safe integer; minimum 0. |
| leftCensored | Left Censored | Required. Safe integer; minimum 0. |
| rightCensored | Right Censored | Required. Safe integer; minimum 0. |
| missing | Missing | Required. Safe integer; minimum 0. |
| includeMissing | Include Missing | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| denominator | Denominator | Required. Safe integer. |
| belowShare | Left-censored count divided by the selected reporting denominator, not a quantified below-limit concentration. | Required. Finite number. |
| measuredShare | Measured Share | Required. Finite number. |
{
"input": {
"measured": 70,
"leftCensored": 20,
"rightCensored": 10,
"missing": 5,
"includeMissing": false
},
"output": {
"denominator": 100,
"belowShare": 0.2,
"measuredShare": 0.7
}
}Limitations and assumptions
- Left-censored records are not quantified concentrations; including missing observations changes the reporting denominator without imputing outcomes.
- 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
- Detection Qualifier Interval Width
Return a supplied detection-qualifier interval width and endpoint flags.
- Biomonitor Nondetect Closure Token
Check a nondetect label against a supplied limit policy.