Choosing the observational likelihood in state-space stock assessment models

Christoffer Moesgaard Albertsen; Anders Nielsen; Uffe Høgsbro Thygesen

Choosing the observational likelihood in state-space stock assessment models

Christoffer Moesgaard Albertsen, Anders Nielsen, Uffe Høgsbro Thygesen

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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 language	English
Publication date	2015
Publication status	Published - 2015
Event	ICES Annual Science Conference 2015 - Copenhagen, Denmark Duration: 21 Sep 2015 → 25 Sep 2015

Conference

Conference	ICES Annual Science Conference 2015
Country/Territory	Denmark
City	Copenhagen
Period	21/09/2015 → 25/09/2015

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ICES CM 2015/A:11

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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",

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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

T2 - ICES Annual Science Conference 2015

Y2 - 21 September 2015 through 25 September 2015

ER -

Choosing the observational likelihood in state-space stock assessment models

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