Hans J. Skaug
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View article: Close-Kin Mark-Recapture Without Age Information: Application to Southern Right Whales
Close-Kin Mark-Recapture Without Age Information: Application to Southern Right Whales Open
Close-kin mark-recapture (CKMR) has recently emerged as an alternative for some situations where other abundance estimation methods are hard to apply. The age of the sampled individuals is very informative for CKMR. In the current paper we…
View article: Previous, current and future monitoring and management of common minke whales in Norway
Previous, current and future monitoring and management of common minke whales in Norway Open
An account of the historical, current and possible future management of common minke whales in Norway is presented. The current management is based on an approach very similar to the International Whaling Commission’s Revised Management Pr…
View article: Sparse Bayesian learning using TMB (Template Model Builder)
Sparse Bayesian learning using TMB (Template Model Builder) Open
Sparse Bayesian Learning, and more specifically the Relevance Vector Machine (RVM), can be used in supervised learning for both classification and regression problems. Such methods are particularly useful when applied to big data in order …
View article: Geographical distribution of close kin in southern right whales on feeding grounds
Geographical distribution of close kin in southern right whales on feeding grounds Open
This study investigated the close kinship structure of southern right whales on feeding grounds during austral summer seasons. The study was based on biopsy samples of 171 individual whales, which were genotyped with 14 microsatellite DNA …
View article: Random effects modeling in fisheries science using AD Model Builder
Random effects modeling in fisheries science using AD Model Builder Open
No abstracts are to be cited without prior reference to the author.Statistical modeling and estimation form an integral part of fisheries science. Heterogeneity in parameters arises in almost every study, along the axes of time, space and …
View article: Population genetic studies in Northeastern Atlantic minke whales
Population genetic studies in Northeastern Atlantic minke whales Open
No abstracts are to be cited without prior reference to the author.Minke whales are the most abundance species of baleen whales in the North Atlantic. As part of current management of minke whales in Norwegian and adjacent waters, a DNA-re…
View article: A Comparison Of Variability And Bias When Ageing Northeastern Atlantic Minke Whales (Balaenoptera Acutorostrata) By Counting Growth Layer Groups In The Mandible And Bulla Tympanica
A Comparison Of Variability And Bias When Ageing Northeastern Atlantic Minke Whales (Balaenoptera Acutorostrata) By Counting Growth Layer Groups In The Mandible And Bulla Tympanica Open
No abstracts are to be cited without prior reference to the author.The age of 43 minke whales (Balaenoptera acutorostrata) was estimated by counting growth layer groups (GLGs) GLGs in 500 thick haemotoxylin stained transverse sections of l…
View article: A TMB Approach to Study Spatial Variation in Weather-Generated Claims in Insurance
A TMB Approach to Study Spatial Variation in Weather-Generated Claims in Insurance Open
In this paper, we use TMB to study spatial variation in weather-generated claims in insurance. Our motivation is twofold. By comparing with INLA, we first find that TMB is a robust and efficient approach to deal with spatial variation of c…
View article: Exploring the likelihood surface in multivariate Gaussian mixtures using Hamiltonian Monte Carlo
Exploring the likelihood surface in multivariate Gaussian mixtures using Hamiltonian Monte Carlo Open
Multimodality of the likelihood in Gaussian mixtures is a well-known problem. The choice of the initial parameter vector for the numerical optimizer may affect whether the optimizer finds the global maximum, or gets trapped in a local maxi…
View article: Genetic tagging of male North Atlantic minke whales through comparison of maternal and foetal DNA-profiles
Genetic tagging of male North Atlantic minke whales through comparison of maternal and foetal DNA-profiles Open
DNA-profiles from 288 mother-foetus pairs were used to obtain partial DNA-profiles for the fathers of the foetuses. The paternal profiles were subsequently matched against those of the males on the Norwegian DNA-register for minke whales u…
View article: Genetic analyses reveal promiscuous mating in female common minke whales, Balaenoptera acutorostrata
Genetic analyses reveal promiscuous mating in female common minke whales, Balaenoptera acutorostrata Open
Based on 25 microsatellites, first order relatedness was established for three dyads of individuals contained in the Norwegian minke whale DNA-register. One large female minke whale was a member of all three dyads. Two competing genealogie…
View article: Asymptotic bias of the hazard probability model under model mis-specification
Asymptotic bias of the hazard probability model under model mis-specification Open
We compare the sensitivity of the estimated effective strip half-width with respect to choice of hazard probability function (Q). This is done by fitting the model under an erroneous assumption about the parametric form of Q, and comparing…
View article: Review of potential line-transect methodologies for estimating abundance of dolphin stocks in the eastern tropical Pacific
Review of potential line-transect methodologies for estimating abundance of dolphin stocks in the eastern tropical Pacific Open
A twelve-year hiatus in fishery-independent marine mammal surveys in the eastern tropical Pacific Ocean (ETP), combined with a mandate to monitor dolphin stock status under international agreements and the need for reliable stock status in…
View article: Evaluating the suitability of close‐kin mark‐recapture as a demographic modelling tool for a critically endangered elasmobranch population
Evaluating the suitability of close‐kin mark‐recapture as a demographic modelling tool for a critically endangered elasmobranch population Open
Estimating the demographic parameters of contemporary populations is essential to the success of elasmobranch conservation programmes, and to understanding their recent evolutionary history. For benthic elasmobranchs such as skates, tradit…
View article: Annex F: Status of DNA Registers
Annex F: Status of DNA Registers Open
How to cite: International Whaling Commission, 2022. Report of the Scientific Committee: Annex F. J. Cetacean Res. Manage. (Suppl.) 23: 246-249.
View article: The heritability of BMI varies across the range of BMI – a heritability curve analysis in a twin cohort
The heritability of BMI varies across the range of BMI – a heritability curve analysis in a twin cohort Open
The heritability of traits such as body mass index (BMI), a measure of obesity, is generally estimated using family, twin, and increasingly by molecular genetic approaches. These studies generally assume that genetic effects are uniform ac…
View article: The Sibling Distribution for Multivariate Life Time Data
The Sibling Distribution for Multivariate Life Time Data Open
A flexible class of multivariate distributions for continuous lifetimes is proposed. The distribution is defined in terms of the age-at-death of m siblings. The expression for the joint density is derived using classical results from mathe…
View article: A Comparison of the Delta Method and the Bootstrap in Deep Learning Classification
A Comparison of the Delta Method and the Bootstrap in Deep Learning Classification Open
We validate the recently introduced deep learning classification adapted Delta method by a comparison with the classical Bootstrap. We show that there is a strong linear relationship between the quantified predictive epistemic uncertainty …
View article: Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020)
Report of the NAMMCO-ICES Workshop on Seal Modelling (WKSEALS 2020) Open
To support sustainable management of apex predator populations, it is important to estimate population size and understand the drivers of population trends to anticipate the consequences of human decisions. Robust population models are nee…
View article: Variation in use of Caesarean section in Norway: An application of spatio-temporal Gaussian random fields
Variation in use of Caesarean section in Norway: An application of spatio-temporal Gaussian random fields Open
Aims: Caesarean section (CS) is a medical intervention performed in Norway when a surgical delivery is considered more beneficial than a vaginal. Because deliveries with higher risk are centralized to larger hospitals, use of CS varies con…
View article: Considering sampling bias in close‐kin mark–recapture abundance estimates of Atlantic salmon
Considering sampling bias in close‐kin mark–recapture abundance estimates of Atlantic salmon Open
Genetic methods for the estimation of population size can be powerful alternatives to conventional methods. Close‐kin mark–recapture (CKMR) is based on the principles of conventional mark–recapture, but instead of being physically marked, …
View article: Issue Information
Issue Information Open
No abstract is available for this article.
View article: An information criterion for automatic gradient tree boosting
An information criterion for automatic gradient tree boosting Open
An information theoretic approach to learning the complexity of classification and regression trees and the number of trees in gradient tree boosting is proposed. The optimism (test loss minus training loss) of the greedy leaf splitting pr…
View article: A comparison of Monte Carlo sampling methods for metabolic network models
A comparison of Monte Carlo sampling methods for metabolic network models Open
Reaction rates (fluxes) in a metabolic network can be analyzed using constraint-based modeling which imposes a steady state assumption on the system. In a deterministic formulation of the problem the steady state assumption has to be fulfi…
View article: Heritability curves: a local measure of heritability
Heritability curves: a local measure of heritability Open
This paper introduces a new measure of heritability which relaxes the classical assumption that the degree of heritability of a continuous trait can be summarized by a single number.This measure can be used in situations where the trait de…
View article: Workshop on the Review and Future of State Space Stock Assessment Models in ICES (WKRFSAM)
Workshop on the Review and Future of State Space Stock Assessment Models in ICES (WKRFSAM) Open
The Workshop on the Review and Future of State Space Stock Assessment Models in ICES fo-cused on future directions of state-space assessment models for ICES stocks (WKRFSAM), utilis-ing recent advances in fisheries modelling research to he…
View article: On the Delta Method for Uncertainty Approximation in Deep Learning.
On the Delta Method for Uncertainty Approximation in Deep Learning. Open
The Delta method is a well known procedure used to quantify uncertainty in statistical models. The method has previously been applied in the context of neural networks, but has not reached much popularity in deep learning because of the sh…
View article: Experimental design for parameter estimation in steady-state linear models of metabolic networks
Experimental design for parameter estimation in steady-state linear models of metabolic networks Open
Metabolic networks are typically large, containing many metabolites and reactions. Dynamical models that aim to simulate such networks will consist of a large number of ordinary differential equations, with many kinetic parameters that mus…