[Feature]: Add capability for seasonal offset in a CPUE catchability #481
Labels
new request
initial entry of a new request
time-vary parm
wishlist
request new feature; bigger than revision; OK to remove after adding to Milestone
Milestone
Describe the solution you would like.
I often see model configurations in which users create season-specific fleets in order to have season-specific Q, and sometimes season-specific selectivity. Most often, it is to get at season-specific Q. Addition of a capability to have season-specific Q would provide a more convenient and probably faster-executing option.
Describe alternatives you have considered
The MGparm approach has specific input for each parameter type. If selected, then season parameters created to do:
A feasible generic implementation could be:
if abs(Block_type_rd) > 10, then block_type = sign(block_type_rd) * (abs(Block_type_rd) - 10).
then value in tens place would be the control for seasonality. This allows seasonality to be in addition to blocks and trends on base parameter.
The use of abs and sign is because a negative block is the indicator for trend approach.
https://vscode.dev/github/nmfs-stock-synthesis/stock-synthesis/blob/main/SS_expval.tpl#L398-L399
Statistical validity, if applicable
NA
Describe if this is needed for a management application
NA
Additional context
No response
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