Bird Damage Loss Percent Estimate Calculator

Compare actual matched protected/exposed vine harvest masses as apparent bird-loss proxy with independent vine exposure; signed exposed gains retained, protection confounds prevent causal bird damage diagnosis.

Description

Protected-versus-exposed harvest comparisons give an apparent loss proxy.

Protected-versus-exposed harvest comparisons give an apparent loss proxy. Protection can change conditions beyond bird access.^[1]

Enter nonempty aligned positive protected masses, nonnegative exposed masses and integer represented vines 1–1,000,000. Return signed losses, pooled fraction and loss per represented vine.

When to use Bird Damage Loss Percent Estimate Calculator

Use Bird Damage Loss Percent Estimate Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. Exposed gains remain negative loss. No causal attribution to birds or treatment equivalence is established.

Prepare the measured vineyard records, aligned lists and independently verified local limits or catalog requested. Keep units, crop stages and observation periods consistent.

How to use Bird Damage Loss Percent Estimate Calculator and understand its results

Prepare the measured vineyard records, aligned lists and independently verified local limits or catalog requested. Keep units, crop stages and observation periods consistent.
Enter pairedProtectedHarvestMassKg, pairedExposedHarvestMassKg, pairedMatchedRepresentedVineCounts using the field table and calculation rules, then run the tool.
Read signedProtectedMinusExposedMassKg, pooledMatchedApparentLossFraction, signedApparentLossKgPerRepresentedVine. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
pairedProtectedHarvestMassKg	Paired protected harvest mass kg	list of number	Required
pairedExposedHarvestMassKg	Paired exposed harvest mass kg	list of number	Required
pairedMatchedRepresentedVineCounts	Paired matched represented vine counts	list of number	Required

Enter nonempty aligned positive protected masses, nonnegative exposed masses and integer represented vines 1–1,000,000. Return signed losses, pooled fraction and loss per represented vine.

loss=protected−exposed; fraction=sum(loss)/sum(protected)

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
signedProtectedMinusExposedMassKg	Signed protected minus exposed mass kg	list of number
pooledMatchedApparentLossFraction	Pooled matched apparent loss fraction	number
signedApparentLossKgPerRepresentedVine	Signed apparent loss kg per represented vine	number

json

{
  "input": {
    "pairedProtectedHarvestMassKg": [
      10,
      20
    ],
    "pairedExposedHarvestMassKg": [
      8,
      12
    ],
    "pairedMatchedRepresentedVineCounts": [
      2,
      4
    ]
  },
  "output": {
    "signedProtectedMinusExposedMassKg": [
      2,
      8
    ],
    "pooledMatchedApparentLossFraction": 0.3333333333333333,
    "signedApparentLossKgPerRepresentedVine": 1.6666666666666667
  }
}

Limitations and assumptions

Exposed gains remain negative loss. No causal attribution to birds or treatment equivalence is established.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Green Harvest Drop Cluster Weight Calculator: Dropped-cluster samples require tare correction before expansion to the represented inventory. The observed sample and represented count serve different roles. For a complementary task, use Rootstock Vigour Classification Lookup: Rootstock vigor comparisons depend on matched scion, site and trial conditions. Relative shoot dry mass can be grouped using explicit local bands.

References

Bird Damage Loss Percent Estimate Calculator — tool.io

Similar or alternative tools

Green Harvest Drop Cluster Weight Calculator
Dropped-cluster samples require tare correction before expansion to the represented inventory. The observed sample and represented count serve different roles.
Rootstock Vigour Classification Lookup
Rootstock vigor comparisons depend on matched scion, site and trial conditions. Relative shoot dry mass can be grouped using explicit local bands.