Description
Return effort-normalized taxon count and logarithmic effort offset.
Biodiversity summaries depend on taxon concepts, sampling effort, detection and missing-status policies. Literal labels and observed shares can organize records while species identity, true abundance, occupancy and conservation status require appropriate ecological evidence and analysis.
Return effort-normalized taxon count and logarithmic effort offset.
When to use this tool
Use Species Count Effort Offset when checking the stated biodiversity record, effort, count or support convention.
How to use the tool and how it works
- Enter observedTaxa, effort, suppliedReferenceEffort. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read effortRatio, countPerEffort, logEffortOffset. Use the output convention below.
Return effort-normalized taxon count and logarithmic effort offset. Require whole observedTaxa >= 0 and positive effort/referenceEffort; countPerEffort = count/effort, logOffset = ln(effort/reference).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| observedTaxa | Observed Taxa | Required. Safe integer; minimum 0. |
| effort | Effort | Required. Finite number; strictly above 0. |
| suppliedReferenceEffort | Supplied Reference Effort | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| effortRatio | Effort Ratio | Required. Finite number. |
| countPerEffort | Count Per Effort | Required. Finite number. |
| logEffortOffset | Log Effort Offset | Required. Finite number. |
{
"input": {
"observedTaxa": 12,
"effort": 4,
"suppliedReferenceEffort": 2
},
"output": {
"effortRatio": 2,
"countPerEffort": 3,
"logEffortOffset": 0.6931471805599453
}
}Limitations and assumptions
- Effort units must match; this does not fit a count model or establish species richness proportional to effort.
- 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 source-aware taxonomy, verified field records and a suitable sampling/detection model for ecological estimates, uncertainty or conservation conclusions.
References
Similar or alternative tools
- Survey Effort Coverage Weight
Return actual/reference survey effort weight.
- Observer Effort Zero Coverage Flag
Return coverage-adjusted observer effort and a flagged rate.