AssignmentLengthDistribution: Assignment length distribution per acoustic PSU
In StoXProject/RstoxBase: Base StoX Functions
AssignmentLengthDistribution R Documentation
Assignment length distribution per acoustic PSU
Description
The function AssignmentLengthDistribution calculates the average length distribution of the hauls assigned to each AcousticPSU defined by DefineBioticAssignment, and weighted by BioticAssignmentWeighting. The weights are scaled in bootstrapping by the number of times each haul is resampled. See Details.
Usage
AssignmentLengthDistribution(LengthDistributionData, BioticAssignment)
Arguments
LengthDistributionData
The LengthDistributionData data.
BioticAssignment
The BioticAssignment process data.
Details
The length distribution is normalized to percentage per AcousticPSU by dividing by the summed length distribution and scaling by 100.
Bootstrapping of acoustic-trawl models involve resampling the hauls assigned to the AcousticPSUs. For StoX <= 3.6.2 this resampling (with replacement) was from all hauls assigned to at least one AcousticPSU associated to each stratum (using ResampleBioticAssignmentByStratum). If different hauls were assigned to different AcousticPSUs this resampling included the risk that none of the assigned hauls of a particular AcousticPSU are resampled in a bootstrap replicate. This will result in all zeros in the weights (column WeightingFactor) of the BioticAssignment input to the AssignmentLengthDistribution function. When the length distributions are normalized, this involves dividing 0 by sum of 0, which results in NaN. This is intended, as it reflects that there does not exist a length distribution for that AcousticPSU. This will result in missing Abundance for the required species, but for missing IndividualTotalLength. To avoid this problem it is adviced to use the resampling function ResampleBioticAssignmentByAcousticPSU instead of ResampleBioticAssignmentByStratum, which resamples for each AcousticPSU and will never result in missing assignment length distribution.
Value
An object of StoX datatype AssignmentLengthDistributionData.
See Also
LengthDistribution to produce the input LengthDistributionData, and DefineBioticAssignment to produce the input BioticAssignment.
StoXProject/RstoxBase documentation built on Nov. 6, 2024, noon
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| AssignmentLengthDistribution | R Documentation |
Assignment length distribution per acoustic PSU
Description
The function AssignmentLengthDistribution calculates the average length distribution of the hauls assigned to each AcousticPSU defined by DefineBioticAssignment, and weighted by BioticAssignmentWeighting. The weights are scaled in bootstrapping by the number of times each haul is resampled. See Details.
Usage
AssignmentLengthDistribution(LengthDistributionData, BioticAssignment)
Arguments
LengthDistributionData |
The |
BioticAssignment |
The |
Details
The length distribution is normalized to percentage per AcousticPSU by dividing by the summed length distribution and scaling by 100.
Bootstrapping of acoustic-trawl models involve resampling the hauls assigned to the AcousticPSUs. For StoX <= 3.6.2 this resampling (with replacement) was from all hauls assigned to at least one AcousticPSU associated to each stratum (using ResampleBioticAssignmentByStratum). If different hauls were assigned to different AcousticPSUs this resampling included the risk that none of the assigned hauls of a particular AcousticPSU are resampled in a bootstrap replicate. This will result in all zeros in the weights (column WeightingFactor) of the BioticAssignment input to the AssignmentLengthDistribution function. When the length distributions are normalized, this involves dividing 0 by sum of 0, which results in NaN. This is intended, as it reflects that there does not exist a length distribution for that AcousticPSU. This will result in missing Abundance for the required species, but for missing IndividualTotalLength. To avoid this problem it is adviced to use the resampling function ResampleBioticAssignmentByAcousticPSU instead of ResampleBioticAssignmentByStratum, which resamples for each AcousticPSU and will never result in missing assignment length distribution.
Value
An object of StoX datatype AssignmentLengthDistributionData.
See Also
LengthDistribution to produce the input LengthDistributionData, and DefineBioticAssignment to produce the input BioticAssignment.
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