scholarly journals On Johnson’s “Sufficientness” Postulates for Feature-Sampling Models

Mathematics ◽  
2021 ◽  
Vol 9 (22) ◽  
pp. 2891
Author(s):  
Federico Camerlenghi ◽  
Stefano Favaro

In the 1920s, the English philosopher W.E. Johnson introduced a characterization of the symmetric Dirichlet prior distribution in terms of its predictive distribution. This is typically referred to as Johnson’s “sufficientness” postulate, and it has been the subject of many contributions in Bayesian statistics, leading to predictive characterization for infinite-dimensional generalizations of the Dirichlet distribution, i.e., species-sampling models. In this paper, we review “sufficientness” postulates for species-sampling models, and then investigate analogous predictive characterizations for the more general feature-sampling models. In particular, we present a “sufficientness” postulate for a class of feature-sampling models referred to as Scaled Processes (SPs), and then discuss analogous characterizations in the general setup of feature-sampling models.

2004 ◽  
Vol 4 (1) ◽  
pp. 62-89 ◽  
Author(s):  
Andreas Hoffjan

This study introduces content analysis as a method of examining the accountant's role. The empirical study is based on 73 advertisements, which are directed primarily at employees who are affected by the management accountant's work. The findings of the study indicate that the subject of accountancy is used particularly in connection with promises of “cost reduction.” Consequently, the majority of advertisements use the accountant stereotype of “savings personified.” In a professional context, the work ethic of the management accountant is given particular emphasis in the advertisements. He/she identifies him/herself with his/her task to the maximum degree, is regarded as loyal to his/her company and, for the most part, is well organized in his/her work. However, the characterization of the management accountant as a well disciplined company-person conflicts with the negative portrayal of his/her professional qualities. In advertisements, the management accountant is portrayed as a rather inflexible, passive, and uncreative specialist who, as a result of these qualities, often demotivates others. The personal characteristics of the management accountant are shown in a negative light. This gives him/her the unappealing image of a humorless, envious, dissociated, and ascetic corporate-person.


2014 ◽  
Vol 129 (3) ◽  
pp. 1449-1499 ◽  
Author(s):  
José Luis Montiel Olea ◽  
Tomasz Strzalecki

Abstract This article provides an axiomatic characterization of quasi-hyperbolic discounting and a more general class of semi-hyperbolic preferences. We impose consistency restrictions directly on the intertemporal trade-offs by relying on what we call “annuity compensations.” Our axiomatization leads naturally to an experimental design that disentangles discounting from the elasticity of intertemporal substitution. In a pilot experiment we use the partial identification approach to estimate bounds for the distributions of discount factors in the subject pool. Consistent with previous studies, we find evidence for both present and future bias.


1980 ◽  
Vol 12 (3) ◽  
pp. 689-709 ◽  
Author(s):  
M. Riedel

Let X(t) be a homogeneous and continuous stochastic process with independent increments. The subject of this paper is to characterize the stable process by two identically distributed stochastic integrals formed by means of X(t) (in the sense of convergence in probability). The proof of the main results is based on a modern extension of the Phragmén-Lindelöf theory.


2017 ◽  
Vol 10 (6) ◽  
pp. 2077-2091 ◽  
Author(s):  
Sabina Assan ◽  
Alexia Baudic ◽  
Ali Guemri ◽  
Philippe Ciais ◽  
Valerie Gros ◽  
...  

Abstract. Due to increased demand for an understanding of CH4 emissions from industrial sites, the subject of cross sensitivities caused by absorption from multiple gases on δ13CH4 and C2H6 measured in the near-infrared spectral domain using CRDS has become increasingly important. Extensive laboratory tests are presented here, which characterize these cross sensitivities and propose corrections for the biases they induce. We found methane isotopic measurements to be subject to interference from elevated C2H6 concentrations resulting in heavier δ13CH4 by +23.5 ‰ per ppm C2H6 ∕ ppm CH4. Measured C2H6 is subject to absorption interference from a number of other trace gases, predominantly H2O (with an average linear sensitivity of 0.9 ppm C2H6 per  % H2O in ambient conditions). Yet, this sensitivity was found to be discontinuous with a strong hysteresis effect and we suggest removing H2O from gas samples prior to analysis. The C2H6 calibration factor was calculated using a GC and measured as 0.5 (confirmed up to 5 ppm C2H6). Field tests at a natural gas compressor station demonstrated that the presence of C2H6 in gas emissions at an average level of 0.3 ppm shifted the isotopic signature by 2.5 ‰, whilst after calibration we find that the average C2H6 : CH4 ratio shifts by +0.06. These results indicate that, when using such a CRDS instrument in conditions of elevated C2H6 for CH4 source determination, it is imperative to account for the biases discussed within this study.


1992 ◽  
Vol 128 ◽  
pp. 65-93 ◽  
Author(s):  
Takeyuki Hida ◽  
Nobuaki Obata ◽  
Kimiaki Saitô

The theory of generalized white noise functionals (white noise calculus) initiated in [2] has been considerably developed in recent years, in particular, toward applications to quantum physics, see e.g. [5], [7] and references cited therein. On the other hand, since H. Yoshizawa [4], [23] discussed an infinite dimensional rotation group to broaden the scope of an investigation of Brownian motion, there have been some attempts to introduce an idea of group theory into the white noise calculus. For example, conformal invariance of Brownian motion with multidimensional parameter space [6], variational calculus of white noise functionals [14], characterization of the Levy Laplacian [17] and so on.


2006 ◽  
Vol 34 (2) ◽  
pp. 837-877 ◽  
Author(s):  
B. J. K. Kleijn ◽  
A. W. van der Vaart

Author(s):  
M J Darlington ◽  
S J Culley

The design requirement is a description of the desired solution to a problem. In engineering design, as in all other, a clear expression of a well-formulated design goal is vital for successful and efficient completion of the design task. The nature of the design requirement and the processes by which it is achieved have been the subject of a wide variety of research. The purpose of the paper is twofold. Firstly, it sets out to collate and discuss representative research in this area in order to give an overview of the current scope of the work. Secondly, it seeks to draw a comparison with the task of developing the design requirement for software and information systems and to initiate a discussion that considers to what extent the substantial body of research in software requirements engineering might help to give an understanding of the design requirement for the engineering design domain. A tentative characterization of the differences between the tasks in the two domains is presented, and representative papers from requirements engineering are used to suggest areas of overlap as a starting point for further investigation.


PMLA ◽  
1951 ◽  
Vol 66 (5) ◽  
pp. 785-794
Author(s):  
Joseph G. Fucilla

Guillén de Castro in his Mocedades del Cid presents us with a characterization of his hero which differs radically from the Cid of the Romancero and the Crónicas. He transforms the renowned medieval warrior into a courtly knight. Ernest Mérimée in the Première Partie des Mocedades del Cid de Guillen de Castro (Toulouse, 1890, page cvi) takes note of the metamorphosis and attributes it to the playwright's inventive genius. But in his brochure, The Cid Theme in France in 1600 (Minneapolis, 1920), Gustave L. Van Robsbroeck casts some doubt on this point of view by bringing to light a novel by Antoine Du Périer, La Eayne et l'Amour d'Arnoul et de Clayremonde (Paris, 1600), containing features similar to the Castro story including the element of courtliness, which, of course, obviously antedate the play. His conclusion is that “There existed a common source—probably a Spanish source—for both the Eayne et L'Amour d'Arnoul et de Clayremonde and Las Mocedades del Cid” (p. 15). Barbara Matulka further enlarges on the subject in her The Cid as a Courtly Hero: from Amadis to Corneille (New York, 1928, pp. 6–40). She notes an early treatment of the courtly Cid theme in Feliciano de Silva's Florisel de Niquea (1532–51) representing books x, xi, and xii of the Amadis series, and cites Jimenez de Ayllon's Los Famosos y Herôicos Hechos del Invencible Cavallero el Cid Ruy Diaz de Bivar (1568) to show that the Cid had been introduced to court prior to the Mocedades and to point out that Ayllon's epic contains situations and details similar to those found in the play. These works, Miss Matulka claims, have been influential through intermediary links between them and our dramatic piece. There is no question but that she is partially correct in her contention, and this we shall endeavor to prove through the discussion of materials which she failed to utilize at the time she made her investigation.


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