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  • Bayesian Computing with INLA: A Review 

    Rue, Håvard; Riebler, Andrea Ingeborg; Sørbye, Sigrunn Holbek; Illian, Janine B.; Simpson, Daniel Peter; Lindgren, Finn Kristian (Journal article; Tidsskriftartikkel, 2016-12-23)
    The key operation in Bayesian inference is to compute high-dimensional integrals. An old approximate technique is the Laplace method or approximation, which dates back to Pierre-Simon Laplace (1774). This simple idea ...
  • The gap phenomenon in parabolic geometries 

    Kruglikov, Boris; The, Dennis (Journal article; Tidsskriftartikkel; Peer reviewed, 2014-09-14)
    The infinitesimal symmetry algebra of any Cartan geometry has maximum dimension realized by the flat model, but often this dimension drops significantly when considering non-flat geometries, so a gap phenomenon arises. For ...
  • Empirical Growth Models for the Renewable Energy Sector 

    Rypdal, Kristoffer (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-25)
    Three simple, empirical models for growth of power consumption in the renewable energy sector are compared. These are the exponential, logistic, and power-law models. The exponential model describes growth at a fixed ...
  • You Just Keep on Pushing My Love over the Borderline: A Rejoinder 

    Simpson, Daniel; Rue, Håvard; Riebler, Andrea Ingeborg; Martins, Thiago Guerrera; Sørbye, Sigrunn Holbek (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-06)
    <i>INTRODUCTION</i>: The point of departure for our paper is that most modern statistical models are built to be flexible enough to model diverse data generating mechanisms. Good statistical practice requires us to limit ...
  • Penalising Model Component Complexity: A Principled, Practical Approach to Constructing Priors 

    Simpson, Daniel; Rue, Håvard; Riebler, Andrea Ingeborg; Martins, Thiago Guerrera; Sørbye, Sigrunn Holbek (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-06)
    In this paper, we introduce a new concept for constructing prior distributions. We exploit the natural nested structure inherent to many model components, which defines the model component to be a flexible extension of a ...
  • Extreme-value statistics from Lagrangian convex hull analysis for homogeneous turbulent Boussinesq convection and MHD convection 

    Pratt, J; Busse, A; Muller, WC; Watkins, NW; Chapman, Sandra (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-20)
    We investigate the utility of the convex hull of many Lagrangian tracers to analyze transport properties of turbulent flows with different anisotropy. In direct numerical simulations of statistically homogeneous and ...
  • Long-range persistence in global surface temperatures explained by linear multibox energy balance models 

    Fredriksen, Hege-Beate; Rypdal, Martin Wibe (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-09-15)
    The temporal fluctuations in global mean surface temperature are an example of a geophysical quantity that can be described using the notions of long-range persistence and scale invariance/scaling, but this description has ...
  • Submaximally symmetric almost quaternionic structures 

    Kruglikov, Boris; Winther, Henrik; Zalabová, Lenka (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-10)
    The symmetry dimension of a geometric structure is the dimension of its symmetry algebra. We investigate symmetries of almost quaternionic structures of quaternionic dimension <i>n</i>. The maximal possible symmetry ...
  • Penalised Complexity Priors for Stationary Autoregressive Processes 

    Sørbye, Sigrunn Holbek; Rue, Håvard (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-23)
    The autoregressive (AR) process of order p(AR(p)) is a central model in time series analysis. A Bayesian approach requires the user to define a prior distribution for the coefficients of the AR(p) model. Although it is ...
  • Jet-determination of symmetries of parabolic geometries 

    Kruglikov, Boris; The, Dennis (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-24)
    We establish 2-jet determinacy for the symmetry algebra of the underlying structure of any (complex or real) parabolic geometry. At non-flat points, we prove that the symmetry algebra is in fact 1-jet determined. Moreover, ...
  • Fractional Gaussian noise: Prior specification and model comparison 

    Sørbye, Sigrunn Holbek; Rue, Håvard (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-07)
    Fractional Gaussian noise (fGn) is a stationary stochastic process used to model anti-persistent or persistent dependency structures in observed time series. Properties of the autocovariance function of fGn are ...
  • Non-degenerate para-complex structures in 6D with large symmetry groups 

    Kruglikov, Boris; Winther, Henrik (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-05-20)
    For an almost product structure J on a manifold M of dimension 6 with non-degenerate Nijenhuis tensor N J, we show that the automorphism group G=Aut(M,J) has dimension at most 14. In the case of equality G is the exceptional ...
  • Conformal differential invariants 

    Kruglikov, Boris (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-06-27)
    We compute the Hilbert polynomial and the Poincar´e function counting the number of fixed jet-order differential invariants of conformal metric structures modulo local diffeomorphisms, and we describe the field of ...
  • Erratum to: Almost complex structures in 6D with nondegenerate Nijenhuis tensors and large symmetry groups 

    Kruglikov, Boris; Winther, Henrik (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-02-23)
    We correct an error in the second part of Theorem 3 of our original paper.
  • Statistical significance of rising and oscillatory trends in global ocean and land temperature in the past 160 years 

    Østvand, Lene; Rypdal, Kristoffer; Rypdal, Martin Wibe (Journal article; Tidsskriftartikkel, 2014-03-20)
    Various interpretations of the notion of a trend in the context of global warming are discussed, contrasting the difference between viewing a trend as the deterministic response to an external forcing and viewing it as a ...
  • Antarctic climate variability on regional and continental scales over the last 2000 years 

    Stenni, Barbara; Curran, Mark A.J.; Abram, Nerilie J.; Orsi, Anais; Goursaud, Sentia; Masson-Delmotte, Valerie; Neukom, Raphael; Goosse, Hugues; Divine, Dmitry V; Van Ommen, Tas; Steig, Eric J.; Dixon, Daniel A.; Thomas, Elizabeth R.; Bertler, Nancy A.N.; Isaksson, Elisabeth; Ekaykin, Alexey; Werner, Martin; Frezzotti, Massimo (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-17)
    Climate trends in the Antarctic region remain poorly characterized, owing to the brevity and scarcity of direct climate observations and the large magnitude of interannual to decadal-scale climate variability. Here, ...
  • Generalized Hamming Weights for Almost Affine Codes 

    Johnsen, Trygve; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-01-17)
    We define generalized Hamming weights for almost affine codes. We show that this definition is natural since we can extend some well known properties of t he generalized Hamming weights for linear codes, to almost ...
  • Relative generalized hamming weights and extended weight polynomials of almost affine codes 

    Johnsen, Trygve; Verdure, Hugues (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-08-23)
    This paper is devoted to giving a generalization from linear codes to the larger class of almost affine codes of two different results. One such result is how one can express the relative generalized Hamming weights of ...
  • A global multiproxy database for temperature reconstructions of the Common Era 

    Emile-Geay, Julien; McKay, Nicholas P; Kaufman, Darrell S; Von Gunten, Lucien; Wang, Jianghao; Anchukaitis, Kevin J; Abram, Nerilie J; Addison, Jason A; Curran, Mark AJ; Evans, Michael N; Henley, Benjamin J; Hao, Zhixin; Martrat, Belen; McGregor, Helen V; Neukom, Raphael; Pederson, Gregory T; Stenni, Barbara; Thirumalai, Kaustubh; Werner, Johannes P; Xu, Chenxi; Divine, Dmitry V; Dixon, Bronwyn C; Gergis, Joelle; Mundo, Ignacio A; Nakatsuka, Takeshi; Phipps, Steven J; Routson, Cody C; Steig, Eric J; Tierney, Jessica E; Tyler, Jonathan J; Allen, Kathryn J; Bertler, Nancy AN; Bjorklund, Jesper; Chase, Brian M; Chen, Min-Te; Cook, Ed; De Jong, Rixt; DeLong, Kristine L; Dixon, Daniel A; Ekaykin, Alexey A; Ersek, Vasile; Filipsson, Helena L; Francus, Pierre; Freund, Mandy B; Frezzotti, Massimo; Gaire, Narayan P; Gajewski, Konrad; Ge, Quansheng; Goosse, Hugues; Gornostaeva, Anastasia; Grosjean, Martin; Horiuchi, Kazuho; Hormes, Anne; Husum, Katrine; Isaksson, Elisabeth; Kandasamy, Selvaraj; Kawamura, Kenji; Kilbourne, K Halimeda; Koc, Nalan; Leduc, Guillaume; Linderholm, Hans W; Lorrey, Andrew M; Mikhalenko, Vladimir; Mortyn, P Graham; Motoyama, Hideaki; Moy, Andrew D; Mulvaney, Robert; Munz, Philipp M; Nash, David J; Oerter, Hans; Opel, Thomas; Orsi, Anais J; Ovchinnikov, Dmitriy V; Porter, Trevor J; Roop, Heidi A; Saenger, Casey; Sano, Masaki; Sauchyn, David; Saunders, Krystyna M; Seidenkrantz, Marit-Solveig; Severi, Mirko; Shao, Xuemei; Sicre, Marie-Alexandrine; Sigl, Michael; Sinclair, Kate; St George, Scott; St Jacques, Jeannine-Marie; Thamban, Meloth; Thapa, Udya Kuwar; Thomas, Elizabeth R; Turney, Chris; Uemura, Ryu; Viau, Andre E; Vladimirova, Diana O; Wahl, Eugene R; White, James WC; Yu, Zicheng; Zinke, Jens (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-07-11)
    Reproducible climate reconstructions of the Common Era (1 CE to present) are key to placing industrial-era warming into the context of natural climatic variability. Here we present a community-sourced database of ...
  • Younger Dryas ice margin retreat triggered by ocean surface warming in central-eastern Baffin Bay 

    Oksman, Mimmi; Weckström, Kaarina; Miettinen, Arto; Juggins, Stephen; Divine, Dmitry V; Jackson, Rebecca; Telford, Richard; Korsgaard, Niels J.; Kučera, Michal (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-18)
    The transition from the last ice age to the present-day interglacial was interrupted by the Younger Dryas (YD) cold period. While many studies exist on this climate event, only few include high-resolution marine records ...

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