Description
Select denominator examined or examined-unresolved, require it positive, and return parasitized/denominator.
Ecological observation summaries depend on sampling effort, eligible time, classified counts and missingness policies. Flower-minutes, area-days and observed proportions have different denominators. Observation support is distinct from true abundance, detection probability or a causal biological-control effect.
Select denominator examined or examined-unresolved, require it positive, and return parasitized/denominator.
When to use this tool
Use Biological Control Observed Parasitism Share when checking the stated observation support, exposure, sample or seasonal-gap convention.
How to use the tool and how it works
- Enter parasitized, examined, unresolved, excludeUnresolved. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read denominator, fraction. Use the output convention below.
Require whole examined>=1, unresolved within examined and parasitized within resolved count. Select denominator examined or examined-unresolved, require it positive, and return parasitized/denominator.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| parasitized | Parasitized | Required. Safe integer; minimum 0. |
| examined | Examined | Required. Safe integer; minimum 1. |
| unresolved | Unresolved | Required. Safe integer; minimum 0. |
| excludeUnresolved | True removes unresolved observations from the denominator; false keeps them. | Required. Boolean. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| denominator | Denominator | Required. Safe integer. |
| fraction | Dimensionless fraction on the stated basis, rather than a percentage number. | Required. Finite number. |
{
"input": {
"parasitized": 20,
"examined": 100,
"unresolved": 20,
"excludeUnresolved": true
},
"output": {
"denominator": 80,
"fraction": 0.25
}
}Limitations and assumptions
- The exclusion policy changes the observed proportion; no true parasitism rate, uncertainty or biological-control recommendation is estimated.
- 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
Use verified representative field records and suitable sampling/detection analysis for ecological inference, uncertainty and management.
References
Similar or alternative tools
- Beneficial Flower Visitation Effort Term
Return visits/(flowers*minutes) and visits/(observers*minutes) separately.
- Mixed Crop Plant Density Relative Term
Return observedPlants/area and that density divided by the sole-crop reference.