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See detailHolonomic approximation through convex integration
Massot, Patrick; Theilliere, Mélanie UL

E-print/Working paper (2021)

Convex integration and the holonomic approximation theorem are two well-known pillars of flexibility in differential topology and geometry. They may each seem to have their own flavor and scope. The goal ... [more ▼]

Convex integration and the holonomic approximation theorem are two well-known pillars of flexibility in differential topology and geometry. They may each seem to have their own flavor and scope. The goal of this paper is to bring some new perspective on this topic. We explain how to prove the holonomic approximation theorem for first order jets using convex integration. More precisely we first prove that this theorem can easily be reduced to proving flexibility of some specific relation. Then we prove this relation is open and ample, hence its flexibility follows from off-the-shelf convex integration. [less ▲]

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See detailInteractive Narratives and Transmedia Storytelling: An Insight on Digital Exhibitions
Camarda, Sandra UL

Scientific Conference (2021, July 09)

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See detailFace-swap Deepfake Detection Using High-frequency Components
Mejri, Nesryne UL

Bachelor/master dissertation (2021)

Over the last years, very deceitful deepfakes applied to human visuals appeared on theInternet. Given their impressive visual quality, they are nowadays considered a potentialthreat for both individuals ... [more ▼]

Over the last years, very deceitful deepfakes applied to human visuals appeared on theInternet. Given their impressive visual quality, they are nowadays considered a potentialthreat for both individuals and organizations. Hence, researchers started investigatingthe flaws of deepfakes to develop automated tools capable of detecting forged content. Asa result, a wide range of deepfake detection methods has been introduced. In particular,deep learning based-approaches have shown impressive performance. Nevertheless, thesemethods are still not sufficiently robust as they usually consider only one type of artifact,either in the spatial or the frequency domain. In this context, this thesis proposes toleverage the high-frequency components extracted from color images jointly with theoriginal color information to detect unusual traces. It introduces an end-to-end trainablemodule that (a) extracts features from precomputed high-frequency components and (b)fuses them with RGB features. The deepfake detection framework not only exploitsthe high-frequency anomalies present in manipulated images but can also be integratedwith the majority of RGB-based deepfake detectors. Experimental results show thatthe proposed approach improves the performance of state-of-the-art networks, such asXceptionNet and EfficientNet, on a challenging deepfake dataset called Celeb-DF. [less ▲]

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See detailMehrsprachige Repertoires in kollaborativen Schreibinteraktionen
Stierwald, Mona UL

Doctoral thesis (2021)

Cette thèse examine la problématique du plurilinguisme et de la plurilitéracie individuelle dans des interactions portant sur des pratiques d'écriture collaborative. Le plurilinguisme et la plurilitéracie ... [more ▼]

Cette thèse examine la problématique du plurilinguisme et de la plurilitéracie individuelle dans des interactions portant sur des pratiques d'écriture collaborative. Le plurilinguisme et la plurilitéracie sont éclairées par les concepts de répertoires et de registres langagiers. Dans ce type d'interaction en face à face, deux ou plusieurs personnes se retrouvent au même endroit pour rédiger un document à partir d'idées partagées en menant une conversation à ce sujet. Il s'agit là de sonder les pratiques litéraciques d'étudiant-e-s plurilingues en études romanes de l'université Goethe de Francfort lorsqu'ils/elles formulent conjointement un texte académique dans une langue cible romane (en français ou en espagnol). Pour ce faire, cette recherche s'inscrit dans une approche qualitative mobilisant une pluralité de méthodologies et de courants théoriques inspirés principalement des recherches menées en sociolinguistique et de l'ethnographie comme la recherche action. Le recueil de données a eu lieu dans le cadre d'un séminaire de recherche-action au cours duquel les étudiant-e-s plurilingues ont réfléchi par écrit sur leurs propres répertoires langagiers et se sont réuni-e-s de manière interactive en groupes pour la rédaction de textes académiques. Les données résultantes ont été analysées par le biais d'une analyse de contenu qualitative et d'une analyse conversationnelle. En outre, des concepts venant des recherches sur le plurilinguisme et sur les processus d'écriture sont mobilisés a fin d'accéder à une vision holistique des dynamiques d'écriture collaborative. Cette recherche ouvre de nouvelles perspectives pour les recherches portant sur la plurilitéracie. D'un point de vue théorique, on voit comment la plurilitéracie structurelle peut être analysée à partir d'interactions portant sur l'écriture collaborative. D'un point de vue méthodologique, elle ouvre des voies de réflexion pour aiguiser la focalisation sur les processus d'interaction, les productions et leurs corrélations avec les parcours des individus impliqués. À cet égard, la relation entre l'ethnographie et l'analyse conversationnelle joue un rôle primordial. En fin, d'un point de vue didactique, il est significatif de voir comment dans les écrits universitaires le projet d'appropriation d'une langue cible peut aller de pair avec la prise en compte des ressources plurilingues. [less ▲]

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See detailOn the move within themselves – cultural distance and negotiation processes of cultural belonging
Murdock, Elke UL; Gales, Sissy

Scientific Conference (2021, July 08)

In a boundary crossing world, having exposure to multiple cultures is becoming norm rather than exception. Children of migrants and children born into mixed national families grow up with more than one ... [more ▼]

In a boundary crossing world, having exposure to multiple cultures is becoming norm rather than exception. Children of migrants and children born into mixed national families grow up with more than one cultural point of reference from birth. In the growing body of literature on bi- and multiculturalism different models of cultural acquisition are described, but still little is known about how the negotiation process takes place and what factors facilitate resolution and well-being. The present study builds on a recent theoretical framework on multicultural identity integration developed by Yampolsky et al. and investigates the role of cultural distance in the negotiation process for cultural belonging. For the present study, we conducted semi-structured interviews with eight young women (Mage = 22.6). All grew up in Germany, yet each had a very different other cultural background ranging from Chile, Columbia, France, Ghana, Hungary, Luxembourg, Russia to Sri Lanka. We asked participants about their sense of belonging, perceived similarities and differences between their cultural influences and their way of positioning themselves within these. Each interview was complemented by two visual exercises illustrating the sense of belonging. The results show that all participants engaged in active negotiation processes and arrived at very different solutions in terms of belonging. The cultural integration process depends on a multitude of factors – cultural distance being one, but parents playing an important role. The findings will be discussed in light of current acculturation models. Explanations will be provided with special focus on implications for migration and acculturation research. [less ▲]

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See detailAnimal Law: Why do we need to work across disciplines?
Bobrowicz, Katarzyna UL

Presentation (2021, July 08)

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See detailLes reconfigurations du politique et du religieux, au prisme de la sécularisation et du bioconservatisme : La Manif pour tous en France et le Family Day en Italie.
Durante, Raphaël UL

Doctoral thesis (2021)

Tensions between politics and religion lead to a very productive scope of investigation for those interested in contemporary democratic reconfigurations. In this context, this thesis will address two ... [more ▼]

Tensions between politics and religion lead to a very productive scope of investigation for those interested in contemporary democratic reconfigurations. In this context, this thesis will address two social phenomena located at the crossroads of political and religious considerations, in a comparative perspective: ‘La Manif pour tous’ - a movement opposing gay- marriage in France – and The Family Day – opposition movement to same-sex civil partnership in Italy. This study highlights the importance of the political and religious context in the structuring, the system of values and the impact of those so-called “anti-gender” movements, through a multidisciplinary approach bringing together conceptual tools from the social movement theory, religious sociology and political philosophy, but also through semi- structured interviews and attendee observations. The comparative perspective will indeed reveal a greater empowerment process for the French case, with more pronounced efforts to distance itself from traditional political and religious institutions. Despite this, this thesis will bring up a certain convergence of these movements towards the formation of a bio-conservative block, steeped in Christian anthropology but also scientific and legal considerations that challenge the principles of contemporary liberal democracies. The bio-conservative block shakes up the opposition between modern autonomy and religious heteronomy, and works on setting up and developing new political cleavages. [less ▲]

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See detailVulnerability in the context of migration: a critical assessment of its conceptualizations and uses
Gilodi, Amalia UL; Albert, Isabelle UL; Nienaber, Birte UL

Scientific Conference (2021, July 07)

The notions of ‘vulnerability’ and ‘vulnerable group’ have increasingly gained prominence in academic literature, policymaking, humanitarian debates and everyday discourses on migration and asylum. Its ... [more ▼]

The notions of ‘vulnerability’ and ‘vulnerable group’ have increasingly gained prominence in academic literature, policymaking, humanitarian debates and everyday discourses on migration and asylum. Its popularity, not limited to this field, has often led academics and practitioners to use ‘vulnerability’ as a self-explanatory condition or phenomenon. However, vulnerability is neither conceptually straight-forward nor politically and morally neutral. Multiple definitions and operationalizations of vulnerability exist across and within different fields of research and practice, without a common and systematic understanding of the concept. The notion of vulnerability can also be instrumentilised as a tool for discrimination, stigmatization, control, exclusion or even reduction of humanitarian assistance, when access to protection is restricted to ‘the most vulnerable’. In the context of the H2020 project MIMY (n°870700), this paper examines the multiplicities and hidden pitfalls behind different conceptualizations and uses of vulnerability and critically reflects on their implication for the study and governance of migration. By unpacking this concept, we hope to highlight both limitations and opportunities enclosed in the notion of vulnerability and encourage migration scholars to understand, address and take a stand before its complexities. Based on these considerations, a multilevel conceptual model of vulnerability in the specific context of migration is proposed. The model aims to capture several types and understandings of vulnerability and how these are (re)produced at different levels and by different actors, including migrants themselves. Particular attention is paid to migrants’ biographical and psychological experiences of vulnerability and how policy and political frameworks may affect them. [less ▲]

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See detailTopics in Computational Number Theory and Cryptanalysis - On Euclidean Lattices, Edwards Curves and Cryptographic Multilinear Maps
Notarnicola, Luca UL

Doctoral thesis (2021)

The content of this thesis is situated between number theory and cryptology. It contributes in several directions of mathematical cryptanalysis and arithmetic geometry, by the use of explicit and ... [more ▼]

The content of this thesis is situated between number theory and cryptology. It contributes in several directions of mathematical cryptanalysis and arithmetic geometry, by the use of explicit and computational methods in number theory. The thesis is divided into four main parts, describing four different works. The first part of this thesis treats cryptographic multilinear maps, introduced in the early 2000s, as extension of bilinear pairings on abelian varieties following a survey by Boneh and Silverberg (Contemp. Math. 2003). The difficulties of constructing efficient cryptographic multilinear maps from algebraic geometry led cryptographers to obtain multilinear maps from the notion of graded encoding systems, following the formalism of Garg, Gentry and Halevi (Eurocrypt 2013), backgrounded from ideas on fully homomorphic encryption. To this date, there are three candidate constructions. Their security however is rather poorly understood and many attacks have flourished over the past years. In this thesis, we consider the CLT13 Scheme, proposed by Coron, Lepoint and Tibouchi (Crypto 2013), constructing multilinear maps over the integers. A vulnerability of this scheme was detected by Gentry, Lewko and Waters (Crypto 2014), by exploiting the composite-ring structure of the plaintext space, enabling a simple two-dimensional lattice attack to reveal secret information. At the same time, the authors suggested a simple countermeasure to prevent this line of attack. By relying on high-dimensional lattice reduction, we design new cryptanalysis against CLT13, overriding the countermeasure of Gentry, Lewko and Waters by several orders of magnitude. Combined with the Cheon et al. attack (Eurocrypt 2015), we reveal all secret parameters of CLT13. By applying our cryptanalysis to concrete instantiations of CLT13-based construc- tions, certain parameter ranges are found unsecure. The second work presented in this thesis isolates the Hidden Lattice Problem as a more general problem appearing in several cryptographic scenarios, among which the Hidden Sub- set Sum Problem, studied by Nguyen and Stern (Crypto 1999). The Nguyen-Stern algorithm for the Hidden Subset Sum Problem builds on the use of orthogonal lattices, which have shown powerful in public-key cryptanalysis. After extending their algorithm to our more general setting, our main contribution is to present, based on duality in lattice theory, a new algorithm for the Hidden Lattice Problem, providing a competitive alternative to the cel- ebrated Nguyen-Stern orthogonal lattice attack. For both algorithms, we provide practical parameters, based on heuristic and rigorous studies of the geometry of the underlying lat- tices. The generality of our definition for the Hidden Lattice Problem allows encompassing multiple number-theoretic problems of cryptographic interest. For these problems, our new algorithm leads to a valuable alternative to the state-of-the-art algorithms. The third work presented in this thesis aims at extending the powerful cryptanalysis by Cheon et al. (Eurocrypt 2015) against the multiparty Diffie-Hellman protocol instantiated un- der the aforementioned CLT13 Scheme. To do so, we formulate, independently of the CLT- framework, a general problem on simultaneous diagonalization of special matrices of low- rank, which we call “incomplete”. Based on techniques from linear algebra, our major contri- bution is the design of efficient algorithms for this problem, providing explicit and practical parameters. We recognize that our algorithms also apply to solve the Approximate Common Divisor Problem based on the Chinese Remainder Theorem (CRT-ACD Problem). In partic- ular, our algorithms lead to quadratic improvements in the input length for the CRT-ACD Problem, and some cases of the Cheon et al. attack. The last work included in this thesis studies Edwards curves, a normal form for elliptic curves, first introduced by Edwards (Bull. Amer. Math. Soc. 2007). This model for elliptic curves has been proposed for elliptic-curve cryptography by the work of Bernstein and Lange (Asiacrypt 2007), by exploiting the efficient Edwards point arithmetic. Their work includes a construction of the Edwards model from the Weierstrass model. While not directly oriented towards cryptographic targets, our study of the Edwards model is of arithmetic-geometric nature. Our main contributions include abstract constructions for the Edwards model, an explicit generalization of the Bernstein-Lange construction, as well as general properties of geometric nature. From an analytic perspective, we complement our study with extensive computer calculations related to the ranks of rational elliptic curves in a family related to Ed- wards curves. Part of our statistical data is based on our extension of an algorithm involving L-functions and relying on the well-known Birch and Swinnerton-Dyer Conjecture for elliptic curves. [less ▲]

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See detailNomads’ Poetic Translingualism. Multiple voices, dialogical writing and space constructions in the work of Liliane Welch and Pierre Joris
Pauly Ep Hansen, Marie Anne UL

Doctoral thesis (2021)

In the past decades, multilingualism has developed into a highly researched topic in literary studies as well as in applied linguistics. Surprisingly, two Anglophone poets, Liliane Welch and Pierre Joris ... [more ▼]

In the past decades, multilingualism has developed into a highly researched topic in literary studies as well as in applied linguistics. Surprisingly, two Anglophone poets, Liliane Welch and Pierre Joris, originally from Luxembourg, have not been included in research despite the rich and manifold perspectives on languages that their work displays. They grew up and were educated in the multilingual environment of Luxembourg before they immigrated to North America while continuing to travel widely. For their writing, they rejected their earlier languages, Luxembourgish, French and German and opted for English as the language of their writing. These observations have motivated the overall research question: What multiple facets of translingualism does a nomadic approach of writing offer? Through close references to the work of Welch and Joris the study aims to investigate the impact of multiple languages on poetic writing, with a particular attention to poets’ linguistic meta-reflections and their positioning in relation to languages. The dissertation is divided into three parts with separate yet related research aims and objectives. Part I sets out the context of the research while it also enquires into the pertinence of associating literary and linguistic dimensions with important features of nomadic theory. The definition of research aims and objectives motivates the description of a concept-based inquiry. An extensive review of relevant studies highlights the international and interdisciplinary character of recent research on multilingualism while nomadism appears as a rich resource for thinking about what moving means for writers. Both areas thus significantly contribute to the description of conceptual and textual cornerstones, which ensure the coherence of the study as a whole. Concepts need not come as abstract ideas only; the palimpsest as conceptual metaphor proves a fitting tool to investigate layers of texts, thoughts and locations. It is a golden thread that all along the dissertation functions as reminder of transformative processes. A distinction between fact-oriented and poetic writing accounts for differences in focus in Parts II and III. Primary text resources in Part II comprise documentary and autobiographical writing as well as academic pieces. These texts help draw the poets’ itineraries, inquire into how they reconstruct former language experiences and develop key elements of a poetics for their creative writing. Gradually, the specificities of each poet’s conception of the role of language multiplicity emerges. Poetry as creative and imaginative work is at the centre of Part III, which scrutinizes texts for their various uses of translingualism in dialogical writing, in translational practices and in the creation of poetic spaces marked by superimposed voices, languages and texts. Among the outcomes of the study, a few points stand out. The elaboration of an interdisciplinary framework stresses the benefits of crossing disciplinary perspectives and negotiating between terminologies in different languages. Part II shows that, contrary to widespread beliefs, both poets reject the mother tongue as language for writing; moreover, they demonstrate the rich cognitive, self- constructive and creative potential that a new self-selected language holds. The fundamental role that nomads’ ongoing reading in several languages holds for translingual writing is another crucial point that both poets constantly demonstrate. Differences, however, appear in their understanding of language multiplicity in texts. While Welch aims at a unified language, Joris is in search of new forms of writing that transgress borders of languages and genres. The analysis of poems in Part III confirms these diverse orientations and underlines the relevance of a distinction between implicit and explicit forms of heterolingualism, which account for a highly diversified range of writing across languages. For a study of all forms, the palimpsest remains a powerful conceptual metaphor to investigate the articulation of languages. The examples show that only an in-depth analysis can bring to light the nature of interactions and indicate their relevance for studies of multilingualism outside the literary context. [less ▲]

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See detailDaily mindfulness, motivational conflict, and stress in university students: An experience-sampling study
Senker, Kerstin; Fries, Stefan; Grund, Axel UL

Speeches/Talks (2021)

University students have a lot of freedom in organizing their everyday lives, but often also feel stressed and torn between action opportunities. Mindfulness entails the self-regulation of attention on ... [more ▼]

University students have a lot of freedom in organizing their everyday lives, but often also feel stressed and torn between action opportunities. Mindfulness entails the self-regulation of attention on immediate experience and an open and non-judging attitude towards these mental experiences. It is positively related to well-being and to intrapsychic congruence. The aim of the present work is to examine the relationship of daily mindfulness, motivational conflict, and perceived stress in the everyday life of university students. During a week of smartphone-based experience-sampling, 108 university students were asked five times daily about their momentary mindfulness and whether they experience motivational conflicts. Additionally, we assessed perceived stress each evening. The relationship between daily mindfulness, motivational conflict, and perceived stress was analyzed on the daily level with multi-level analyses. Both aggregated daily conflict (i.e., feeling that one should be doing something else) and mindfulness (i.e., being non-judgmental) yielded an effect on perceived stress, even when controlling for between-person differences in study load, for example. Findings underline the relevance of mindfulness for perceived stress in academic contexts and thereby also show an approach to positively influence well-being in university students in the future. [less ▲]

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See detailChronique de droit des marchés financiers
Conac, Pierre-Henri UL

in Revue des Sociétés (2021)

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See detailLifelike Computing Systems
Stein, Anthony; Tomforde, Sven; Botev, Jean UL et al

in Proceedings of the Lifelike Computing Systems Workshop (LIFELIKE) (2021, July)

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See detailFederated Learning-based Scheme for Detecting Passive Mobile Attackers in 5G Vehicular Edge Computing
Boualouache, Abdelwahab UL; Engel, Thomas UL

in Annals of Telecommunications (2021)

Detecting passive attacks is always considered difficult in vehicular networks. Passive attackers can eavesdrop on the wireless medium to collect beacons. These beacons can be exploited to track the ... [more ▼]

Detecting passive attacks is always considered difficult in vehicular networks. Passive attackers can eavesdrop on the wireless medium to collect beacons. These beacons can be exploited to track the positions of vehicles not only to violate their location privacy but also for criminal purposes. In this paper, we propose a novel federated learning-based scheme for detecting passive mobile attackers in 5G Vehicular Edge Computing. We first identify a set of strategies that can be used by attackers to efficiently track vehicles without being visually detected. We then build an efficient Machine Learning (ML) model to detect tracking attacks based only on the receiving beacons. Our scheme enables Federated Learning (FL) at the edge to ensure collaborative learning while preserving the privacy of vehicles. Moreover, FL clients use a semi-supervised learning approach to ensure accurate self-labeling. Our experiments demonstrate the effectiveness of our proposed scheme to detect passive mobile attackers quickly and with high accuracy. Indeed, only 20 received beacons are required to achieve 95\% accuracy. This accuracy can be achieved within 60 FL rounds using 5 FL clients in each FL round. The obtained results are also validated through simulations. [less ▲]

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See detailInvestigating the associations of trajectories of depressive symptoms and self-perceived health and incident dementia : an unsupervised machine learning approach.
Klee, Matthias UL; Leist, Anja UL

Poster (2021, July)

Background: Risk factors for dementia show inter-individually varying trajectories over the lifespan. However, risk factors have been mainly investigated with one time-point assessments. New research ... [more ▼]

Background: Risk factors for dementia show inter-individually varying trajectories over the lifespan. However, risk factors have been mainly investigated with one time-point assessments. New research suggests that certain risk factor trajectories are associated with increased risk of adverse cognitive outcomes (Demnitz et al., 2020 [https://doi.org/10.1101/2020.05.20.20106963]; Singh-Manoux et al., 2018 [https://doi.org/10.1016/j.jalz.2017.06.2637]). However, it remains unclear how sequential and simultaneous changes of risk factors alter the individual risk for developing dementia. Testing the joint contribution of trajectories of depressive symptoms and self-perceived health on incidence of dementia, we hypothesized that consistently poor as well as deteriorating trajectories increase the risk for incident dementia, and explored possible interactions of the trajectories. Method: A total of 5,326 respondents to the SHARE survey, mean age 73.9 years, and 6 complete follow-ups spanning ~13 years, answered the EURO-D depression scale, self-perceived health (SPH) (t1-t5), and self-reported dementia diagnosis at last follow-up (t6). To investigate the predictive ability of distinct longitudinal trajectories, we applied unsupervised statistical learning methods (K-means cluster modelling). Clusters indicated distinct risk factor trajectories, which were used as exposures in stepwise logistic regressions to predict incident dementia, controlling for age, gender, education, and country. Result: Cluster analysis revealed five distinct trajectories each for SPH and EURO-D, with varying dementia incidence. In stepwise logistic regressions, respondents with trajectories “consistently poor health” and “consistently high depression” showed elevated risk of dementia (OR = 4.02 [1.39, 14.75] and OR = 2.26 [1.03, 4.95], respectively) compared to the combined baseline risk for “consistently low depression” and “consistently good health”. Interactions were not significant. However, respondents with the combination of “consistently high depression” and “consistently poor health” showed increased risk (N = 246; 6.1% dementia). Conclusion: Applying unsupervised machine learning is helpful to incorporate longitudinal information on depressive symptoms and self-perceived health and model these risk factors longitudinally to test their contribution to explain incidence of dementia. The predictive ability of the trajectories of depressive symptoms and self-perceived health for dementia indicates the potential for improving the identification of people at risk for developing dementia in late life by exploiting trajectory information readily accessible through regular medical check-ups in old age. [less ▲]

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See detailFinance Crowd Analysis Project (FINCAP)
Wolff, Christian UL; Zhang, Lu UL

Report (2021)

More than 100 research teams (RTs) from around the world tested the same set of hypotheses on the same data. They worked independently and wrote an academic paper based on their findings. These reports ... [more ▼]

More than 100 research teams (RTs) from around the world tested the same set of hypotheses on the same data. They worked independently and wrote an academic paper based on their findings. These reports were be evaluated by more than 30 distinguished academics whom we refer to as peer evaluators (PEs). Their feedback was be passed on to the RTs so that they can revise their papers. The project coordinators will study the #fincap results to learn about the scientific process. They have committed ex-ante to a meta-science analysis which was frozen before any instructions and data were given to the RTs and PEs. This frozen “pre-analysis plan” was uploaded to the Open Science Framework on Monday, 2021-01-11. The project will lead to a peer-reviewed academic publication at high level. [less ▲]

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