Description
equivalentDays = sum(activeHours)/suppliedHoursPerDay.
Insect sampling effort can be expressed as trap-nights, active hours, flower-minutes, distance or area-times-beats. Normalizing catch by effort makes its denominator explicit, but does not automatically estimate abundance or equalize detection.
equivalentDays = sum(activeHours)/suppliedHoursPerDay.
When to use this tool
Use Trap Exposure Day Fraction when normalizing a supplied catch, visit count or sampling exposure.
How to use the tool and how it works
- Enter activeHours, suppliedHoursPerDay. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read equivalentDays. Use the output convention below.
Require positive suppliedHoursPerDay and nonnegative activeHours. equivalentDays = sum(activeHours)/suppliedHoursPerDay. The denominator declares the number of active hours constituting one equivalent day.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| activeHours | Active Hours | Required. Array of finite number; maximum items 256. |
| suppliedHoursPerDay | Supplied Hours Per Day | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| equivalentDays | Equivalent Days | Required. Finite number. |
{
"input": {
"activeHours": [
12,
6
],
"suppliedHoursPerDay": 24
},
"output": {
"equivalentDays": 0.75
}
}Limitations and assumptions
- Equivalent days are an effort conversion, not automatically calendar days or trap-nights. Overlapping periods and comparable sampling conditions must be established separately.
- 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 a suitable sampling and detection model for abundance inference, and review actual deployments and conditions before aggregating effort.
References
Similar or alternative tools
- Trap Night Valid Exposure
Return trapNights as their dot product, summing validNights[i]*traps[i].
- Trap Catch Per Trap Night Term
trapNights = traps*nights*functioningFraction; catchPerTrapNight = catchCount/trapNights.