Ara es mostren els items 15-25 de 25

    • Pluviometric regionalization of Catalunya: a compositional data methodology 

      Gibergans Bàguena, José; Ortego Martínez, María Isabel; Tolosana Delgado, Raimon (Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE), 2011)
      Text en actes de congrés
      Accés obert
      The aim of this paper is to introduce a methodology for de¯ning groups from regionalized com- positional data, through a hierarchical clustering algorithm aware of both the spatial dependence and the compositional character ...
    • Pluviometric regionalization of Catalunya: a compositional data methodology 

      Gibergans Bàguena, José; Ortego Martínez, María Isabel; Tolosana Delgado, Raimon (CIMNE, 2011)
      Text en actes de congrés
      Accés obert
      The aim of this paper is to introduce a methodology for de¯ning groups from regionalized com- positional data, through a hierarchical clustering algorithm aware of both the spatial dependence and the compositional character ...
    • Principal balances 

      Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José; Tolosana Delgado, Raimon (International Centre for Numerical Methods in Engineering (CIMNE), 2011)
      Text en actes de congrés
      Accés obert
      Principal balances are defined as a sequence of orthonormal balances which maximize successively the explained variance in a data set. Apparently, computing principal balances requires an exhaustive search along all possible ...
    • Principal balances 

      Pawlowsky Glahn, Vera; Egozcue Rubí, Juan José; Tolosana Delgado, Raimon (CIMNE, 2011)
      Text en actes de congrés
      Accés obert
      Principal balances are de ned as a sequence of orthonormal balances which maximize successively the explained variance in a data set. Apparently, computing principal balances requires an exhaustive search along all ...
    • The compositional meaning of a detection limit 

      Gerald van den Boogaart, K.; Tolosana Delgado, Raimon; Bren, Matevz (CIMNE, 2011)
      Text en actes de congrés
      Accés obert
      In compositional data analysis a value below detection limit (BDL) is typically modeled as the definitive information that the actual value is below some fixed value - the detection limit (see e.g. Palarea- Albaladejo ...
    • The compositional meaning of a detection limit 

      van den Boogaart, Karl Gerald; Tolosana Delgado, Raimon; Bren, Matevz (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2011)
      Text en actes de congrés
      Accés obert
      Conclusions The chemical interpretation of the detection limit and its stochastic model counterpart has thus different consequences for the statistical analysis than we would expect from the word by word interpretation of ...
    • Trend analysis for daily rainfall series of Barcelona 

      Ortego Martínez, María Isabel; Gibergans Bàguena, José; Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Llasat Botija, Maria Carmen (2009-09-11)
      Text en actes de congrés
      Accés obert
      Frequency analysis of hydrological series is a key point to acquire an in-depth understanding of the behaviour of hydrologic events. The occurrence of extreme hydrologic events in an area may imply great social and ...
    • Unmixing compositional data with Bayesian techniques 

      Tolosana Delgado, Raimon (CIMNE, 2011)
      Text en actes de congrés
      Accés obert
      A general problem in compositional data analysis is the unmixing of a composition into a series of pure endmembers. In its most complex version, one does neither know the composition of these endmembers, nor their relative ...
    • Unmixing compositional data with Bayesian techniques 

      Tolosana Delgado, Raimon (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2011)
      Text en actes de congrés
      Accés obert
      A general problem in compositional data analysis is the unmixing of a composition into a series of pure endmembers. In its most complex version, one does neither know the composition of these endmembers, nor their relative ...
    • Uses and misuses of compositional data in sedimentology 

      Tolosana Delgado, Raimon (2012-12)
      Article
      Accés restringit per política de l'editorial
      This paper serves two goals. The first part shows how mass evolution processes of different nature become undistinguishable once we take a size-limited, noisy sample of its compositional fingerprint: processes of exponential ...
    • Wave height data assimilation using non-stationary kriging 

      Tolosana Delgado, Raimon; Egozcue Rubí, Juan José; Sánchez-Arcilla Conejo, Agustín; Gómez Aguar, Jesús Javier (2011-03)
      Article
      Accés restringit per política de l'editorial
      Data assimilation into numerical models should be both computationally fast and physically meaningful, in order to be applicable in online environmental surveillance. We present a way to improve assimilation for computationally ...