1,720,992 research outputs found
Extending the family of Bayesian bootstraps and exchangeable urn schemes
No full textNo abstract availabl
A Bayesian non-parametric approach to survival analysis using polya trees
No full textNo abstract availabl
A Bayesian nonparametric approach to determining a maximum tolerated dose
No full textThis paper presents a Bayesian nonparametric approach to determining a maximum tolerated dose. Typically, this would be carried out in a phase I trial. We describe a design and analysis which makes use of the Polya tree prior distributions
Discussion of Martingale Posterior Distributions by E. Fong, C. Holmes, and S. G. Walker
Full text linkIn this discussion note, we respond to the fascinating paper "Martingale
Posterior Distributions" by E. Fong, C. Holmes, and S. G. Walker with a couple
of comments. On the basis of previous research, a theorem is stated regarding
the relationship between frequentist bootstrap and stick-breaking process.Comment: 2 pages. A written contribution to the RSS discussion meeting for
JRSS-
A note on "Bayesian nonparametric estimators derived from conditional Gibbs structures"
Full text linkA note on “Bayesian nonparametric estimators derived from conditional Gibbs structures
On a class of random probability measures with general predictive structure
No full textIn this paper we investigate a recently introduced class
of nonparametric priors, termed generalized Dirichlet process priors.
Such priors induce (exchangeable random) partitions which are characterized by a more elaborate clustering structure than those arising from other widely used priors. A natural area of application of these random probability measures is represented by species sampling problems and, in particular, prediction problems in genomics. To this end we study both the distribution of the number of distinct species present in a sample and the distribution of the number of new species conditionally on an observed sample. We also provide the Bayesian nonparametric estimator for the number of new species in an additional sample of given size and for the discovery probability as function of the size of the additional sample. Finally, the study of its conditional structure is completed by the determination of the posterior distribution
On a generalized Chu-Vandermonde identity
No full textIn the present paper we introduce a generalization of the well-known Chu-Vandermonde identity. In particular, by inductive reasoning, the identity is extended to a multivariate setup in terms of the fourth Lauricella function. The main interest in such generalizations derives from the species diversity estimation and, in particular, prediction problems in Genomics and Ecology within a Bayesian nonparametric framework
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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