Archive for statistical inference

Bayesian Inference: Theory, Methods, Computations [book review]

Posted in Statistics with tags , , , , , , , , , , , , , , , , , , , , , on November 12, 2024 by xi'an

Bayesian Inference: Theory, Methods, Computations by Silvelyn Zwanzig and Rauf Ahmad, both from Uppsala University, is a recent book published by Chapman & Hall / CRC Press. About 300p long (plus appendices), it covers the core aspects of Bayesian inference, namely the decision theoretic motivations, its asymptotic validation, the specifics of estimation and testing, and the computational approximations (MC, MCMC, ABC, VB), with entries on prior specification and Normal linear models. And some R codes. It is (and feels like) constructed from Master and PhD courses (at Uppsala University), with a rigorous mathematical presentation and many examples, some related to biostatistics. Drawings from the first author’s daughter are included in most chapters, to this reviewer’s bemusement. From a further personal viewpoint, the book also reads rather close to my (Bayesian) choice of a Bayesian textbook, which proves rather accurate since several chapters are inspired by my own Bayesian Choice. as acknowledged therein. As well as by the more recent Statistical Decision Theory: Estimation, Testing, and Selection by Liese & Miescke (2008) and Introduction to the Theory of Statistical Inference by Liero & Zwanzig (2011). Witness, for instance, an example of prior construction for capture-recapture experiments on lizards as analysed by my PhD student Dupuis (1995) [with a curious switch to the authors on p.263] and  also included in The Bayesian Choice (with drawing 2.9 incorrect in that the lizards there have marks on their backs, instead of the code adopted by the ecologists, namely cutting one specific phalange for each capture).

Other minor quandaries: The usual issue of quoting the wrong edition for creating a method, as when citing Jeffreys (1946) for inventing non-informative priors [p.53], failing to point out the parameterisation invariance of intrinsic losses [p.95]considering that Bayes factors are only relevant for obtaining evidence against the null hypothesis [p.216], recommending BIC and DIC (!) [pp.232-6], advocating sampling importance resampling (SIR) for approximate sampling from the target (omitting infinite variance issues) [p.253], defining annealing as using “several trial distributions” [p.261], a mistake in ABC-MCMC [p.274] since the case when the simulated data is too far from the actual data should lead to a repetition rather than a pure rejection.

All in all, a reasonable textbook with some recent input, but still lacking in originality, if I may subjectively say so.

[Disclaimer about potential self-plagiarism: this post or an edited version of it could possibly appear in my Books Review section in CHANCE.]

Faculty Position in [computational] Statistics at EPFL [reposted]

Posted in Mountains, pictures, Statistics, Travel, University life with tags , , , , , , , , , , , on September 4, 2024 by xi'an

The School of Basic Sciences at EPFL is conducting an open-rank search for a Professor in Statistics. Appointment can be at the Tenure Track, Associate or Full Professor levels, depending on the qualifications of the successful applicant. We seek outstanding candidates with research interests in any domain of core statistical inference, including methodology, theory or applications. Indicative areas include, but are not restricted to, computationally intensive inference, large-scale and/or high-dimensional inference, and penalised and/or nonparametric inference.

At the tenured level, we expect world-leading profiles in their respective fields. At the Tenure Track level, we expect candidates showing exceptional promise to develop into world leaders. Priority will be given to the overall originality and promise of a candidate’s work rather than to any particular area of specialization.

Candidates should hold a PhD and have an outstanding record of scientific accomplishments in the field, commensurate with the rank to which they are applying. Commitment to excellent teaching at the undergraduate, master and doctoral levels is also expected. The successful candidate is expected to play an important role in the EPFL’s new MSc in Statistics.

EPFL, with its main campus located in Lausanne, Switzerland, on the shores of Lake Geneva, is a highly-international, dynamically growing and well-funded institution fostering excellence and diversity. The EPFL environment is multi-lingual and multi-cultural.

As a technical university covering essentially the entire palette of engineering and science, EPFL offers a fertile environment for multi-disciplinary research collaborations. Mathematics and Statistics at EPFL benefit from the presence of the Bernoulli Centre for Fundamental Studies on the EPFL campus, and boast a world-class faculty and outstanding facilities.

Applications should include a cover letter, a CV with a list of publications, a concise statement of research (maximum three pages) and teaching interests (one page), and the names and addresses (including e-mail) of three to five (for the rank of Assistant Professor) or five to seven (for the rank of Associate or Full Professor) referees who have already agreed to supply a letter upon request.

Application deadline: 1st November 2024

Applications should be uploaded to the EPFL recruitment page:

Enquiries may be addressed to:

Prof. Maryna Viazovska
Director of the Mathematics Institute
& Co-Chair of the Search Committee

and/or

Prof. Victor Panaretos
Co-Chair of the Search Committee

at the address stat-search.2024@epfl.ch

For additional information, please consult http://www.epfl.ch, sb.epfl.ch, math.epfl.ch

EPFL is an equal opportunity employer and family-friendly university. It is committed to increasing the diversity of its faculty and strongly encourages qualified women to apply.

Bye’ ometrika

Posted in Books, pictures, Statistics, University life with tags , , , , , , , , , , , on February 1, 2024 by xi'an

Ocean’s four!

Posted in Books, pictures, Statistics, University life with tags , , , , , , , , , , , , , , , , , , , on October 25, 2022 by xi'an

Fantastic news! The ERC-Synergy¹ proposal we submitted last year with Michael Jordan, Éric Moulines, and Gareth Roberts has been selected by the ERC (which explains for the trips to Brussels last month). Its acronym is OCEAN [hence the whale pictured by a murmuration of starlings!], which stands for On intelligenCE And Networks​: Mathematical and Algorithmic Foundations for Multi-Agent Decision-Making​. Here is the abstract, which will presumably turn public today along with the official announcement from the ERC:

Until recently, most of the major advances in machine learning and decision making have focused on a centralized paradigm in which data are aggregated at a central location to train models and/or decide on actions. This paradigm faces serious flaws in many real-world cases. In particular, centralized learning risks exposing user privacy, makes inefficient use of communication resources, creates data processing bottlenecks, and may lead to concentration of economic and political power. It thus appears most timely to develop the theory and practice of a new form of machine learning that targets heterogeneous, massively decentralized networks, involving self-interested agents who expect to receive value (or rewards, incentive) for their participation in data exchanges.

OCEAN will develop statistical and algorithmic foundations for systems involving multiple incentive-driven learning and decision-making agents, including uncertainty quantification at the agent’s level. OCEAN will study the interaction of learning with market constraints (scarcity, fairness), connecting adaptive microeconomics and market-aware machine learning.

OCEAN builds on a decade of joint advances in stochastic optimization, probabilistic machine learning, statistical inference, Bayesian assessment of uncertainty, computation, game theory, and information science, with PIs having complementary and internationally recognized skills in these domains. OCEAN will shed a new light on the value and handling data in a competitive, potentially antagonistic, multi-agent environment, and develop new theories and methods to address these pressing challenges. OCEAN requires a fundamental departure from standard approaches and leads to major scientific interdisciplinary endeavors that will transform statistical learning in the long term while opening up exciting and novel areas of research.

Since the ERC support in this grant mostly goes to PhD and postdoctoral positions, watch out for calls in the coming months or contact us at any time.

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a random day, in Paris

Posted in Statistics, University life with tags , , , , , , , , , on September 28, 2022 by xi'an