Partitioning of catch from a trip.
Details
list with two members 'fractions' and 'groupDefinition'
'fractions' is a data.table with columns:
- tripid
trip identifier
- species
species identifier
- groupid
identifies the group the fraction is provided for. Groups are further specified in 'groupDefinition'
- fraction
fraction of the total catch of species in the given group
'groupDefinition' is a data.table with columns:
- groupid
identifies the group the defintion is provided for.
- ...
one or more custom columns definint the group