Description
Return exposure / totalExposure and count times that share.
A share divides an included amount by a declared total. An empty total is mathematically different from an observed zero share and may require an explicit availability flag.
Return exposure / totalExposure and count times that share.
When to use this tool
Use Microbial Count Exposure Share when you need a proportion with a clearly defined denominator.
How to use the tool and how it works
- Enter count, exposure, totalExposure. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read exposureShare, contribution. Use the output convention below.
Require exposure between zero and positive totalExposure. Return exposure / totalExposure and count times that share.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| count | Count | Required. Safe integer; minimum 0. |
| exposure | Exposure | Required. Finite number; minimum 0. |
| totalExposure | Total Exposure | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| exposureShare | Exposure Share | Required. Finite number. |
| contribution | Contribution | Required. Finite number. |
{
"input": {
"count": 12,
"exposure": 2,
"totalExposure": 8
},
"output": {
"exposureShare": 0.25,
"contribution": 3
}
}Limitations and assumptions
- The contribution can be fractional; exposure units must match and the calculation is not a detection probability estimate.
- 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
Inspect the underlying counts or quantities and report missing-denominator cases separately when aggregating results.
References
Similar or alternative tools
- Colony Count Denominator Contribution
Multiply nonnegative count by positive suppliedInverseEffectiveVolume and divide by positive totalDenominatorWeight.
- Microbiology Observation Detection Effort Term
Subtract excludedFields from examinedFields and require at least one usable field.