Journal article
Prediction–variance relation in a state-space fish stock assessment model
The state-space assessment model (SAM) is extended by allowing a functional relationship between observation variance and the corresponding prediction. An estimated relationship between observation variance and predicted value for each individual observation allows the model to assign smaller (or larger) variance to predicted larger log-observations.
This relation is different from the usual assumption of constant variance of log-observations within age groups. The prediction–variance link is implemented and compared to the usual constant variance assumption for the official assessments of North East Arctic cod and haddock. For both of these stocks, the prediction–variance link is found to give a significant improvement.
Language: | English |
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Publisher: | Oxford University Press |
Year: | 2021 |
Pages: | 3650-3657 |
ISSN: | 10959289 and 10543139 |
Types: | Journal article |
DOI: | 10.1093/icesjms/fsab205 |
ORCIDs: | Nielsen, Anders , Berg, Casper W. and 0000-0002-9336-4297 |