Choosing the observational likelihood in state-space stock assessment models

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Abstract

By implementing different observational likelihoods in a state-space age-based stock assessment model, we are able to compare the goodness-of-fit and effects on estimated fishing mortallity for different model choices. Model fit is improved by estimating suitable correlations between agegroups. We show by simulations that modelling catch as numbers-at-age is more suitable than proportions if the uncertainty of age-classifications is small
Original languageEnglish
Publication date2015
Publication statusPublished - 2015
EventICES Annual Science Conference 2015 - Copenhagen, Denmark
Duration: 21 Sep 201525 Sep 2015

Conference

ConferenceICES Annual Science Conference 2015
CountryDenmark
CityCopenhagen
Period21/09/201525/09/2015

Bibliographical note

ICES CM 2015/A:11

Cite this

@conference{af2000168a074eba9386597dfbb07a5c,
title = "Choosing the observational likelihood in state-space stock assessment models",
abstract = "By implementing different observational likelihoods in a state-space age-based stock assessment model, we are able to compare the goodness-of-fit and effects on estimated fishing mortallity for different model choices. Model fit is improved by estimating suitable correlations between agegroups. We show by simulations that modelling catch as numbers-at-age is more suitable than proportions if the uncertainty of age-classifications is small",
author = "Albertsen, {Christoffer Moesgaard} and Anders Nielsen and Thygesen, {Uffe H{\o}gsbro}",
note = "ICES CM 2015/A:11; ICES Annual Science Conference 2015, ICES ASC 2015 ; Conference date: 21-09-2015 Through 25-09-2015",
year = "2015",
language = "English",

}

Albertsen, CM, Nielsen, A & Thygesen, UH 2015, 'Choosing the observational likelihood in state-space stock assessment models' ICES Annual Science Conference 2015, Copenhagen, Denmark, 21/09/2015 - 25/09/2015, .

Choosing the observational likelihood in state-space stock assessment models. / Albertsen, Christoffer Moesgaard; Nielsen, Anders; Thygesen, Uffe Høgsbro.

2015. Abstract from ICES Annual Science Conference 2015, Copenhagen, Denmark.

Research output: Contribution to conferenceConference abstract for conferenceResearch

TY - ABST

T1 - Choosing the observational likelihood in state-space stock assessment models

AU - Albertsen, Christoffer Moesgaard

AU - Nielsen, Anders

AU - Thygesen, Uffe Høgsbro

N1 - ICES CM 2015/A:11

PY - 2015

Y1 - 2015

N2 - By implementing different observational likelihoods in a state-space age-based stock assessment model, we are able to compare the goodness-of-fit and effects on estimated fishing mortallity for different model choices. Model fit is improved by estimating suitable correlations between agegroups. We show by simulations that modelling catch as numbers-at-age is more suitable than proportions if the uncertainty of age-classifications is small

AB - By implementing different observational likelihoods in a state-space age-based stock assessment model, we are able to compare the goodness-of-fit and effects on estimated fishing mortallity for different model choices. Model fit is improved by estimating suitable correlations between agegroups. We show by simulations that modelling catch as numbers-at-age is more suitable than proportions if the uncertainty of age-classifications is small

M3 - Conference abstract for conference

ER -

Albertsen CM, Nielsen A, Thygesen UH. Choosing the observational likelihood in state-space stock assessment models. 2015. Abstract from ICES Annual Science Conference 2015, Copenhagen, Denmark.