# Blog

The SIPTA blog started out in 2011 as a separate WordPress website and was integrated into the SIPTA website in 2021. Everyone in the SIPTA Community can contribute! Please
contact our
Executive Editor if you are interested in doing so. Examples of such contributions are reports on meetings, reviews of books or recent literature,
interviews, software presentations, etcetera.

Posted on June 6, 2021 by Ryan Martin

The book *Inferential Models* develops a new framework for statistical inference, one that assumes no prior, but returns (something like) a posterior probability distribution that can be used for drawing inferences. Moreover, that probability-like output satisfies a strong calibration property, called *validity*, which, among other things, implies that procedures derived from it provably control frequentist error rates. How is this related to imprecise probability? Indeed, this is not a book about imprecise probability, but it turns out that the inferential model’s probability-like output must be imprecise in order to achieve the validity property. Therefore, random sets, belief/plausibility functions, etc., play an important role in the development of this theory of statistical inference.

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Posted on March 24, 2021 by Dennis Mauá and Fabio Cozman

Credal networks combine the intuitive expressivity of graphs and the principled treatment and flexibility of imprecise probability to deliver a powerful framework for uncertainty management. Here, we briefly motivate the use of credal networks, provide a historical account of their development and present a commented bibliography on existing surveys and tutorials on the topic.

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Posted on March 9, 2016 by Jasper De Bock

On 13 May 2015, after four years of intensive research under the enthousiastic supervision of Gert de Cooman, I succesfully defended my PhD Thesis, entitled “Credal Networks under Epistemic Irrelevance: Theory and Algorithms”. The jury was composed of Fabio Cozman, Enrique Miranda, Serafín Moral, Joris Walraevens, Dirk Aeyels, Dries Benoit, Jan Van Campenhout and Rik Van de Walle. My dissertation presents a detailed study of credal networks under epistemic irrelevance, which are probabilistic graphical models that can compactly and intuitively represent the uncertainty that is associated with the key variables in some domain, and which can then be used to answer various domain-specific queries (compute inferences) that are of interest to the user. They share many of the nice features of Pearl’s celebrated Bayesian networks, but have the added advantage that they can represent uncertainty in a more flexible and realistic way.

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Posted on November 6, 2015 by Christoph Jansen and Julia Plass

The 8th Workshop on Principles and Methods of Statistical Inference with Interval Probability, organized by the working group “Foundations of Statistics and Their Applications” of the Department of Statistics and the “Munich Center for Mathematical Philosophy (MCMP)” of the Department of Philosophy from the LMU Munich took place from the 1st to the 6th of September 2015 (actually we ended at the 5th, because unfortunately our excursion was cancelled because of bad weather forecast…).

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Posted on November 2, 2015 by Serena Doria

The 9th International Symposium on Imprecise Probability: Theories and Applications was held from Monday 20 to Friday 24 July 2015 in the Italian city of Pescara. This conference was a result of the productive cooperation among the members of the Steering Committee, formed by Thomas Augustin, Gert de Cooman, Enrique Miranda, Erik Quaeghebeur, Teddy Seidenfeld, and myself. I wish to thank the members of the Local Organizing Committee, Attilio Grilli, Mariangela Scorrano and Andrea Di Cencio for their valuable help and the Department of Engineering and Geology of the University G. d’Annunzio for its financial support.

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Posted on January 5, 2015 by Enrique Miranda

The sixth SIPTA school on imprecise probabilities was held in the beautiful city of Montpellier (France), on July 21-25, 2014.The school was composed of twenty five participants, from no less than ten different coutnries. It was organized by Kevin Loquin from LIRMM in Montpellier, with the collaboration of Olivier Strauss, Erik Quaeghebeur and Enrique Miranda.
The school was held in the beautiful botanic institute, built in the end of the nineteenth century, situated just next to the oldest french botanic garden.

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Posted on November 11, 2014 by Inés Couso

Random sets and random fuzzy sets as ill-perceived random variables. An introduction for PhD students and practitioners, by Inés Couso, Didier Dubois and Luciano Sánchez. Springer Briefs in Applied Sciences and Technology, subseries: Springer Briefs in Computational Intelligence. 2014.
The notion of random set has been around for about 50 years, and has been considered rather independently by two sets of prominent authors. There are the works published in the mid-sixties by well-known economists like Aumann and Debreu on the integration of set-valued functions, followed by a full-fledged mathematical development by Kendall and Matheron.

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Posted on October 27, 2014 by Arthur van Camp and Stavros Lopatatzidis

The 7th edition of the Workshop on Principles and Methods of Statistical Inference with Interval Probability (abbreviated as WPMSIIP in the most pronounceable way), organised by the SYSTeMS Research group of Ghent University, took place in Ghent from 8 until 12 September 2014.
There were 17 participants from 6 countries.
Every morning and afternoon had its own session in which 2 or 3 persons presented something about a specific topic, in order to stir up the debate, allowing for ample time to discuss and work together.

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Posted on July 30, 2014 by Seamus Bradley

A workshop on Imprecise Probabilities in Statistics and Philosophy took place at LMU Munich on the 27th and 28th of June. The workshop was co-organised by the Munich Center for Mathematical Philosophy and the LMU statistics department. There were speakers from four continents, and a broad range of views in philosophy and statistics were represented. The conference was a great success and we hope that this leads to closer ties between the philosophy and statistics communities.

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Posted on July 17, 2014 by Matthias C. M. Troffaes

Recently, two books have been published on imprecise probability theory. Lower Previsions: a monograph on said subject by myself and Gert de Cooman. Introduction to Imprecise Probabilities: a collection of contributed chapters on a wide range of topics, edited by Thomas Augustin, Frank Coolen, Gert de Cooman, and myself, with contributions from Joaquín Abellán, Alessandro Antonucci, Cassio P. de Campos, Giorgio Corani, Sébastien Destercke, Didier Dubois, Robert Hable, Filip Hermans, Nathan Huntley, Andrés Masegosa, Enrique Miranda, Serafín Moral, Michael Oberguggenberger, Erik Quaeghebeur, Glenn Shafer, Damjan Skulj, Michael Smithson, Lev Utkin, Gero Walter, Vladimir Vovk, Paolo Vicig, and Marco Zaffalon.

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Posted on June 24, 2014 by Ignacio Montes

This thesis, supervised by Enrique Miranda and Susana Montes, was defended on May 16th. The jury was composed of Susana Díaz, Serafín Moral and Bernard De Baets. This thesis deals with the problem of comparing alternatives defined under some lack of information, that is considered to be either uncertainty, imprecision or both together.

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Posted on April 24, 2014 by Andrea Wiencierz

My PhD thesis deals with the statistical problem of analyzing the relationship between a response variable and one or more explanatory variables when these quantities are only imprecisely observed. Regression methods are some of the most popular and commonly employed methods of statistical data analysis. Like most statistical tools, regression methods are usually based on the assumption that the analyzed data are precise and correct observations of the variables of interest. In statistical practice, however, often only incomplete or uncertain information about the data values is available.

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Posted on April 14, 2014 by Matthias C.M. Troffaes

Improb started in 2008 as a fairly small library for solving simple toy examples involving natural extension. The idea was to support exact rational calculations for lower previsions, by means of Komei Fukuda’s linear programming package cddlib. The very first incarnation of the library simply supported calculating the (unconditional) natural extension from any finite collection of assessments, and checking for avoiding sure loss and coherence. For about two years, not much happened with the code, until 2010.

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Posted on February 6, 2014 by Giorgio Corani

A classifier is a statistical model of the relationship between the attributes (*features*) of an object and its category (*class*).
Classifiers are learned from a training set and later are used on the test set to predict the class of a new object given its features.
Credal classifiers extend traditional classifiers allowing for set-valued (or *indeterminate*) predictions of classes.
The output set is typically larger when the data set is small or it contains many missing values.
Credal classifiers aim at producing reliable classifications also in conditions of poor information.
I am aware of only two software suitable for credal classification.

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Posted on January 9, 2014 by Dennis D. Mauá

My PhD thesis is about connecting three hard computational problems that arise in tasks involving graph-based probabilistic reasoning, namely, the problems of maximum a posteriori (MAP) inference in Bayesian networks, planning with influence diagrams, and belief updating in credal networks under strong independence (or simply strong credal networks). Roughly speaking, in the MAP inference problem we seek the most probable explanation of a complex phenomena represented as a Bayesian network, a graph-based description of a multivariate joint probability distribution where nodes are identified with random variables and local conditional probability distributions.

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Posted on January 7, 2014 by Alessandro Antonucci

The sixth edition of WPMSIIP, the Workshop on Principles and Methods of Statistical Inference with Interval Probability was held in Lugano (Switzerland) between the first and the second week of September 2013. The workshop was a follow-up to previous editions, held in Durham (2008, 2010), Munich (2009, 2012), and Lublijana (2011).
The 2013 edition was organized by the Imprecise Probability Group of IDSIA. About 25 participants from ten different countries attended the workshop.

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Posted on September 24, 2013 by Sebastien Destercke

The Eighth International Symposium on Imprecise Probabilities: Theories and Applications (ISIPTA ‘13) took place in the nice city of Compiègne, from July 2nd to July 5th. We have to thank Fabio Cozman, Thierry Denoeux, Teddy Seidenfeld (and myself) for the scientific organization, and Cédric Baudrit, Véronique Berger-Cherfaoui, Thierry Denoeux, Mylène Masson, Benjamin Quost, Mohamed Sallak (and myself) for the local organization. With the participants, they all contributed to make of this ISIPTA a very interesting and friendly meeting.

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Posted on May 17, 2013 by Erik Quaeghebeur

Dear colleagues,
On Wednesday 15 May, I participated in the meeting ‘Open access versus Commercial Publishing’ organized by the maths and computer science section of the Dutch Royal Academy of Sciences. The speakers consisted of two clear proponents of Open Access, an Elsevier Senior VP presenting her Company’s efforts in the Open Access area, and somebody giving a more descriptive overview of the issues at hand. I found the meeting very interesting and I think the topic is relevant to all researchers.

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Posted on October 23, 2012 by Gero Walter

From September 10 to 15, the Working Group Methodological Foundations of Statistics and their Applications of the Department of Statistics at LMU Munich hosted the Fifth Workshop on Principles and Methods of Statistical Inference with Interval Probability in Munich.
During one week, recent research in the field of Imprecise Probability Theory and the potential of imprecise methods to improve statistical analysis was vividly discussed by the workshop’s participants, who included international guests from the UK, France, Russia, Iran, Slovenia, Canada, and Switzerland.

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Posted on October 3, 2011 by Enrique Miranda

The 7th International Symposium on Imprecise Probability: Theories and Applications was held in the beautiful city of Innsbruck (Austria), on July 25—28, 2011. It was organized by Frank Coolen, Gert de Cooman, Thomas Fetz and Michael Oberguggenberger, with the help in the local organization of Anna Bombasaro, Bernhard Schmelzer and Reinhard Stix.
A total of 40 papers dealing with theoretical and practical aspects of imprecise probabilities were presented, both with a poster and with a short talk.

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