Ergebnisse für *

Zeige Ergebnisse 1 bis 25 von 26.

  1. A note on maximin and Bayesian D-optimal designs in weighted polynomial regression
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,3)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.3)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,3
    Schlagworte: Regressionsanalyse; Schätztheorie; Theorie
    Umfang: 14 S
    Bemerkung(en):
  2. Testing for symmetric error distribution in nonparametric regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,11)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.11)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,11
    Schlagworte: Regressionsanalyse; Nichtparametrisches Verfahren; Statistischer Test; Theorie
    Umfang: 19 S
    Bemerkung(en):
  3. Maximin and Bayesian optimal designs for regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,10)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.10)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,10
    Schlagworte: Regressionsanalyse; Schätztheorie; Theorie
    Umfang: 15 S
    Bemerkung(en):
  4. A power comparison between nonparametric regression tests
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,22)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.22)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,22
    Schlagworte: Statistischer Test; Nichtparametrisches Verfahren; Regressionsanalyse; Theorie
    Umfang: 13 S, graph. Darst
    Bemerkung(en):
  5. A note on testing symmetry of the error distribution in linear regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,25)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.25)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,25
    Schlagworte: Regressionsanalyse; Statistischer Test; Theorie
    Umfang: 20 S
    Bemerkung(en):
  6. A simple nonparametric estimator of a monotone regression function
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,26)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.26)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,26
    Schlagworte: Regressionsanalyse; Nichtparametrisches Verfahren; Schätztheorie
    Umfang: 25 S, graph. Darst
    Bemerkung(en):
  7. Locally E-optimal designs for exponential regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,37)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.37)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,37
    Schlagworte: Regressionsanalyse; Modellierung; Theorie
    Umfang: 19 S
    Bemerkung(en):
  8. Finite sample performance of sequential designs for model identification
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,32)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.32)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,32
    Schlagworte: Regressionsanalyse; Modellierung; Stichprobenerhebung; Theorie
    Umfang: 21 S, graph. Darst
    Bemerkung(en):
  9. Bayesian and maximin optimal designs for heteroscedastic regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Technische Informationsbibliothek (TIB) / Leibniz-Informationszentrum Technik und Naturwissenschaften und Universitätsbibliothek
    RR 8460(2003,36)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    W 1490 (2003.36)
    uneingeschränkte Fernleihe, Kopie und Ausleihe
    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Druck
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,36
    Schlagworte: Regressionsanalyse; Modellierung; Theorie; Heteroskedastizität
    Umfang: 23 S
    Bemerkung(en):
  10. Finite sample performance of sequential designs for model identification
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    Classical regression analysis is usually performed in two steps. In a first step an appropriate model is identified to describe the data generating process and in a second step statistical inference is performed in the identified model. An... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,32)
    keine Fernleihe

     

    Classical regression analysis is usually performed in two steps. In a first step an appropriate model is identified to describe the data generating process and in a second step statistical inference is performed in the identified model. An intuitively appealing approach to the design of experiment for these different purposes are sequential strategies, which use parts of the sample for model identification and adapt the design according to the outcome of the identification steps. In this paper we investigate the finite sample properties of two sequential design strategies, which were recently proposed in the literature. A detailed comparison of sequential designs for model discrimination in several regression models is given by means of a simulation study. Some non-sequential designs are also included in the study.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49366
    Schriftenreihe: [Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,32]
    Umfang: Online-Ressource (21 S.), graph. Darst.
  11. Maximin optimal designs for the compartmental model
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    For the compartmental model we determine optimal designs, which are robust against misspecifications of the unknown model parameters. We propose a maximin approach based on D-efficiencies and provide designs that are optimal with respect to the... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,35)
    keine Fernleihe

     

    For the compartmental model we determine optimal designs, which are robust against misspecifications of the unknown model parameters. We propose a maximin approach based on D-efficiencies and provide designs that are optimal with respect to the particular choice of various parameter regions.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49341
    Schriftenreihe: [Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,35]
    Umfang: Online-Ressource (8 S.)
  12. Bayesian and maximin optimal designs for heteroscedastic regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    The problem of constructing standardized maximin D-optimal designs for weighted polynomial regression models is addressed. In particular it is shown that, by following the broad approach to the construction of maximin designs introduced recently by... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,36)
    keine Fernleihe

     

    The problem of constructing standardized maximin D-optimal designs for weighted polynomial regression models is addressed. In particular it is shown that, by following the broad approach to the construction of maximin designs introduced recently by Dette, Haines and Imhof (2003), such designs can be obtained as weak limits of the corresponding Bayesian Φq-optimal designs. The approach is illustrated for two specific weighted polynomial models and also for a particular growth model.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49353
    Schriftenreihe: [Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,36]
    Umfang: Online-Ressource (23 S.)
  13. Locally E-optimal designs for exponential regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    In this paper we investigate locally E- and c-optimal designs for exponential regression models of the form _k i=1 ai exp(??ix). We establish a numerical method for the construction of efficient and locally optimal designs, which is based on two... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,37)
    keine Fernleihe

     

    In this paper we investigate locally E- and c-optimal designs for exponential regression models of the form _k i=1 ai exp(??ix). We establish a numerical method for the construction of efficient and locally optimal designs, which is based on two results. First we consider the limit ?i ? ? and show that the optimal designs converge weakly to the optimal designs in a heteroscedastic polynomial regression model. It is then demonstrated that in this model the optimal designs can be easily determined by standard numerical software. Secondly, it is proved that the support points and weights of the locally optimal designs in the exponential regression model are analytic functions of the nonlinear parameters ?1, . . . , ?k. This result is used for the numerical calculation of the locally E-optimal designs by means of a Taylor expansion for any vector (?1, . . . , ?k). It is also demonstrated that in the models under consideration E-optimal designs are usually more efficient for estimating individual parameters than D-optimal designs.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49363
    Schriftenreihe: [Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,37]
    Umfang: Online-Ressource (19 S.)
  14. A note on nonparametric estimation of the effective dose in quantal bioassay
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    For the common binary response model we propose a direct method for the nonparametric estimation of the effective dose level ED? (0 < ? < 1). The estimator is obtained by the composition of a nonparametric estimate of the quantile response curve and... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2004,1)
    keine Fernleihe

     

    For the common binary response model we propose a direct method for the nonparametric estimation of the effective dose level ED? (0 < ? < 1). The estimator is obtained by the composition of a nonparametric estimate of the quantile response curve and a classical density estimate. The new method yields a simple and reliable monotone estimate of the effective dose level curve ? ? ED? and is appealing to users of conventional smoothing methods as kernel estimators, local polynomials, series estimators or smoothing splines. Moreover it is computationally very efficient, because it does not require a numerical inversion of a monotonized estimate of the quantile dose response curve. We prove asymptotic normality of the new estimate and compare it with an available alternative estimate (based on a monotonized nonparametric estimate of the dose response curve and the calculation of the inverse function) by means of a simulation study.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49357
    Schriftenreihe: [Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2004,01]
    Umfang: Online-Ressource (17 S.), graph. Darst.
  15. A note on testing the covariance matrix for large dimension
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    We consider the problem of testing hypotheses regarding the covariance matrix of multivariate normal data, if the sample size s and dimension n satisfy lim [n,s→∞] n/s = y. Recently, several tests have been proposed in the case, where the sample size... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2004,2)
    keine Fernleihe

     

    We consider the problem of testing hypotheses regarding the covariance matrix of multivariate normal data, if the sample size s and dimension n satisfy lim [n,s→∞] n/s = y. Recently, several tests have been proposed in the case, where the sample size and dimension are of the same order, that is y ∈ (0,∞). In this paper we consider the cases y = 0 and y = ∞. It is demonstrated that standard techniques are not applicable to deal with these cases. A new technique is introduced, which is of its own interest, and is used to derive the asymptotic distribution of the test statistics in the extreme cases y = 0 and y = ∞.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49373
    Schriftenreihe: [Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2004,02]
    Umfang: Online-Ressource (9 S.)
  16. A power comparison between nonparametric regression tests
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    In this paper, we consider three major types of nonparametric regression tests that are based on kernel and local polynomial smoothing techniques. Their asymptotic power comparisons are established systematically under the fixed and contiguous... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,22)
    keine Fernleihe

     

    In this paper, we consider three major types of nonparametric regression tests that are based on kernel and local polynomial smoothing techniques. Their asymptotic power comparisons are established systematically under the fixed and contiguous alternatives, and are also illustrated through non-asymptotic investigations and finite-sample simulation studies.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49367
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,22
    Umfang: Online-Ressource (13 S.), graph. Darst.
  17. A simple nonparametric estimator of a monotone regression function
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    In this paper a new method for monotone estimation of a regression function is proposed. The estimator is obtained by the combination of a density and a regression estimate and is appealing to users of conventional smoothing methods as kernel... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,26)
    keine Fernleihe

     

    In this paper a new method for monotone estimation of a regression function is proposed. The estimator is obtained by the combination of a density and a regression estimate and is appealing to users of conventional smoothing methods as kernel estimators, local polynomials, series estimators or smoothing splines. The main idea of the new approach is to construct a density estimate from the estimated values ˆm(i/N) (i = 1, . . . ,N) of the regression function to use these “data” for the calculation of an estimate of the inverse of the regression function. The final estimate is then obtained by a numerical inversion. Compared to the conventially used techniques for monotone estimation the new method is computationally more efficient, because it does not require constrained optimization techniques for the calculation of the estimate. We prove asymptotic normality of the new estimate and compare the asymptotic properties with the unconstrained estimate. In particular it is shown that for kernel estimates or local polynomials the monotone estimate is first order asymptotically equivalent to the unconstrained estimate. We also illustrate the performance of the new procedure by means of a simulation study.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49358
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,26
    Umfang: Online-Ressource (25 S.), graph. Darst.
  18. Numerical construction of maximin optimal designs for binary response models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    For the binary response model, we determine optimal designs which are robust wit respect to the misspecifications of the unknown parameters. We propose a maximin approach and provide a numerical method to identify the best two point designs for the... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,29)
    keine Fernleihe

     

    For the binary response model, we determine optimal designs which are robust wit respect to the misspecifications of the unknown parameters. We propose a maximin approach and provide a numerical method to identify the best two point designs for the commonly applied link functions. This method is broadly applicable and can be extended to designs with a given number (>= 2) of support points and further link functions. The results are illustrated for the logistic and probit model, for which the maximin optimal designs are found explicitly.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49355
    Schriftenreihe: Technical Report / Universität Dortmund, SFB 475 Komplexitätsreduktion in Multivariaten Datenstrukturen ; 2003,29
    Umfang: Online-Ressource (17 S.)
  19. A note on the maximization of matrix valued Hankel determinants with applications
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    In this note we consider the problem of maximizing the determinant of moment matrices of matrix measures. The maximizing matrix measure can be characterized explicitly by having equal (matrix valued) weights at the zeros of classical (one... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,9)
    keine Fernleihe

     

    In this note we consider the problem of maximizing the determinant of moment matrices of matrix measures. The maximizing matrix measure can be characterized explicitly by having equal (matrix valued) weights at the zeros of classical (one dimensional) orthogonal polynomials. The results generalize classical work of Schoenberg (1959) to the case of matrix measures. As a statistical application we consider several optimal design problems in linear models, which generalize the classical weighing design problems.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Schriftenreihe: [Technical Report / Sonderforschungsbereich 475, Komplexitätsreduktion in Multivariaten Datenstrukturen, Universität Dortmund ; 2003,09]
    Umfang: Online-Ressource (13 S.)
  20. A note on maximin and Bayesian D-optimal designs in weighted polynomial regression
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    We consider the problem of finding D-optimal designs for estimating the coefficients in a weighted polynominal regression model with a certain efficiency function depending on two unknown parameters, which models he heteroscedastic error structure.... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,3)
    keine Fernleihe

     

    We consider the problem of finding D-optimal designs for estimating the coefficients in a weighted polynominal regression model with a certain efficiency function depending on two unknown parameters, which models he heteroscedastic error structure. This problem is tackled by adopting a Bayesian and a maximin approach, and optimal designs supported on a minimal number of support points are determined explicitly.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Schriftenreihe: [Technical Report / Sonderforschungsbereich 475, Komplexitätsreduktion in Multivariaten Datenstrukturen, Universität Dortmund ; 2003,03]
    Umfang: Online-Ressource (14 S.)
  21. On robust and efficient designs for risk estimation in epidemiologic studies
    Autor*in: Dette, Holger
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    We consider the design problem for the estimation of several scalar measures suggested in the epidemiological literature for comparing the success rate in two samples. The designs considered so far in the literature are local in the sense that they... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2008,3)
    keine Fernleihe

     

    We consider the design problem for the estimation of several scalar measures suggested in the epidemiological literature for comparing the success rate in two samples. The designs considered so far in the literature are local in the sense that they depend on the unknown probabilities of success in the two groups and are not necessarily robust with respect to their misspecification. A maximin approach is proposed to obtain efficient and robust designs for the estimation of the relative risk, attributable risk and odds ratio, whenever a range for the success rates can be specified by the experimenter. It is demonstrated that the designs obtained by this method are usually more efficient than the uniform design, which allocates equal sample sizes to the two groups.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Volltext (kostenfrei)
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Weitere Identifier:
    hdl: 10419/49368
    Schriftenreihe: [Technical Report / Sonderforschungsbereich 475, Komplexitätsreduktion in Multivariaten Datenstrukturen, Universität Dortmund ; 2003,08]
    Umfang: Online-Ressource (13 S.), graph. Darst.
  22. Maximin and Bayesian optimal designs for regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    For many problems of statistical inference in regression modelling, the Fisher information matrix depends on certain nuisance parameters which are unknown and which enter the model nonlinearly. A common strategy to deal with this problem within the... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,10)
    keine Fernleihe

     

    For many problems of statistical inference in regression modelling, the Fisher information matrix depends on certain nuisance parameters which are unknown and which enter the model nonlinearly. A common strategy to deal with this problem within the context of design is to construct maximin optimal designs as those designs which maximize the minimum value of a real valued (standardized) function of the Fisher information matrix, where the minimum is taken over a specified range of the unknown parameters. The maximin criterion is not differentiable and the construction of the associated optimal designs is therefore difficult to achieve in practice. In the present paper the relationship between maximin optimal designs and a class of Bayesian optimal designs for which the associated criteria are differentiable is explored. In particular, a general methodology for determining maximin optimal designs is introduced based on the fact that in many cases these designs can be obtained as weak limits of appropriate Bayesian optimal designs.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Schriftenreihe: [Technical Report / Sonderforschungsbereich 475, Komplexitätsreduktion in Multivariaten Datenstrukturen, Universität Dortmund ; 2003,10]
    Umfang: Online-Ressource (15 S.)
  23. Testing for symmetric error distribution in nonparametric regression models
    Erschienen: 2003
    Verlag:  Univ., SFB 475, Dortmund

    For the problem of testing symmetry of the error distribution in a nonparametric regression model we propose as a test statistic the difference between the two empirical distribution functions of estimated residuals and their counterparts with... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,11)
    keine Fernleihe

     

    For the problem of testing symmetry of the error distribution in a nonparametric regression model we propose as a test statistic the difference between the two empirical distribution functions of estimated residuals and their counterparts with opposite signs. The weak convergence of the difference process to a Gaussian process is shown. The covariance structure of this process depends heavily on the density of the error distribution, and for this reason the performance of a symmetric wild bootstrap procedure is discussed in asymptotic theory and by means of a simulation study. In contrast to the available procedures the new test is also applicable under heteroscedasticity.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Schriftenreihe: [Technical Report / Sonderforschungsbereich 475, Komplexitätsreduktion in Multivariaten Datenstrukturen, Universität Dortmund ; 2003,11]
    Umfang: Online-Ressource ([19] S.)
  24. Efficient experimental design for the Behrens-Fisher problem with application to bioassay
    Erschienen: 2003
    Verlag:  [Univ., SFB 475], [Dortmund]

    A common approach in the design of experiment for the problem of comparing two means from a normal distribution is to assume knowledge of the ratio of the population variances. The optimal sampling ratio is proportional to the square root of this... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,21)
    keine Fernleihe

     

    A common approach in the design of experiment for the problem of comparing two means from a normal distribution is to assume knowledge of the ratio of the population variances. The optimal sampling ratio is proportional to the square root of this quantity. In this paper it is demonstrated that a misspecification of this ratio can cause a substantial loss in power of the corresponding tests. As a robust alternative a maximin approach is used to construct designs, which are efficient, whenever the experimenter is able to specify a specific region for the ratio of the population variances. The advantages of the robust designs for inference in the Behrens-Fisher problem are illustrated by means of a simulation study and an application to the design of experiment for bioassay is presented.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Schriftenreihe: [Technical Report / Sonderforschungsbereich 475, Komplexitätsreduktion in Multivariaten Datenstrukturen, Universität Dortmund ; 2003,21]
    Umfang: Online-Ressource ([11] S.)
  25. A note on testing symmetry of the error distribution in linear regression models
    Erschienen: 2003
    Verlag:  [Univ., SFB 475], [Dortmund]

    In the classical linear regression model the problem of testing for symmetry of the error distribution is considered. The test statistic is a functional of the difference between the two empirical distribution functions of the estimated residuals and... mehr

    ZBW - Leibniz-Informationszentrum Wirtschaft, Standort Kiel
    DS 35 (2003,25)
    keine Fernleihe

     

    In the classical linear regression model the problem of testing for symmetry of the error distribution is considered. The test statistic is a functional of the difference between the two empirical distribution functions of the estimated residuals and their counterparts with opposite signs. The weak convergence of the difference process to a Gaussian process is established. The covariance structure of this process depends heavily on the density of the error distribution, and for this reason the performance of a symmetric wild bootstrap procedure is discussed in asymptotic theory and by means of a simulation study.

     

    Export in Literaturverwaltung   RIS-Format
      BibTeX-Format
    Hinweise zum Inhalt
    Quelle: Verbundkataloge
    Sprache: Englisch
    Medientyp: Buch (Monographie)
    Format: Online
    Schriftenreihe: [Technical Report / Sonderforschungsbereich 475, Komplexitätsreduktion in Multivariaten Datenstrukturen, Universität Dortmund ; 2003,25]
    Umfang: Online-Ressource ([20] S.)