The Kullback-Leibler Divergence as an Estimator of the Statistical Properties of CMB Maps

The identification of unsubtracted foreground residuals in the cosmic microwave background maps on large scales is of crucial importance for the analysis of polarization signals. These residuals add a non-Gaussian contribution to the data. We propose the Kullback-Leibler (KL) divergence as an effective, non-parametric test on the one-point probability distribution function of the data. With motivation in information theory, the KL divergence takes into account the entire range of the distribution and is highly non-local. We demonstrate its use by analyzing the large scales of the Planck 2013 SMICA temperature fluctuation map and find it consistent with the expected distribution at a level of 6%. Comparing the results to those obtained using the more popular Kolmogorov-Smirnov test, we find the two methods to be in general agreement.Comment: 12 pages, 5 figures, minor change, as published in JCA

Skewness and Kurtosis as Indicators of Non-Gaussianity in Galactic Foreground Maps

Observational cosmology is entering an era in which high precision will be required in both measurement and data analysis. Accuracy, however, can only be achieved with a thorough understanding of potential sources of contamination from foreground effects. Our primary focus will be on non- Gaussian effects in foregrounds. This issue will be crucial for coming experiments to determine B-mode polarization. We propose a novel method for investigating a data set in terms of skewness and kurtosis in locally defined regions that collectively cover the entire sky. The method is demonstrated on two sky maps: (i) the SMICA map of Cosmic Microwave Background fluctuations provided by the Planck Collaboration and (ii) a version of the Haslam map at 408 MHz that describes synchrotron radiation. We find that skewness and kurtosis can be evaluated in combination to reveal local physical information. In the present case, we demonstrate that the local properties of both maps are predominantly Gaussian. This result was expected for the SMICA map; that it also applies for the Haslam map is surprising. The approach described here has a generality and flexibility that should make it useful in a variety of astrophysical and cosmological contexts.Comment: 15 pages, 7 figures, minor change, as published in JCA

gofasta:Command-line utilities for genomic epidemiology research

SUMMARY: gofasta comprises a set of command-line utilities for handling alignments of short assembled genomes in a genomic epidemiology context. It was developed for processing large numbers of closely related SARS-CoV-2 viral genomes and should be useful with other densely sampled pathogen genomic datasets. It provides functions to convert sam-format pairwise alignments between assembled genomes to fasta format; to annotate mutations in multiple sequence alignments, and to extract sets of sequences by genetic distance measures for use in outbreak investigations. AVAILABILITY AND IMPLEMENTATION: gofasta is an open-source project distributed under the MIT license. Binaries are available at https://github.com/virus-evolution/gofasta, from Bioconda, and through the Go programming language’s package management system. Source code and further documentation, including walkthroughs for common use cases, are available on the GitHub repository

Monopolizing force?: police legitimacy and public attitudes towards the acceptability of violence

Why do people believe that violence is acceptable? In this paper we study people’s normative beliefs about the acceptability of violence to achieve social control (as a substitute for the police, for self-protection and the resolution of disputes) and social change (through violent protests and acts to achieve political goals). Addressing attitudes towards violence among young men from various ethnic minority communities in London, we find that procedural justice is strongly correlated with police legitimacy, and that positive judgments about police legitimacy are associated with more negative views about the use of violence. We conclude with the idea that police legitimacy has an additional, hitherto unrecognized, empirical property – by constituting the belief that the police monopolise rightful force in society, legitimacy has a ‘crowding out’ effect on positive views of private violence

Legitimacy and procedural justice in prisons

All social situations are ‘ordered’ in some way, comprising a constantly changing set of relationships that establish the structure within which human action occurs. In many circumstances this order is hidden, even ephemeral; we are barely aware of its presence. But this is not the case in prisons. Social order in prison is in many ways highly visible: it is established and managed by the omnipresent rules that govern prison life. In large part these rules are oriented toward reproducing the extant regime. They lay down apparently strict criteria for what constitutes order and what is to be done if it is breached. But what is meant by order in prison? Most socia

Enabling and constraining police power: on the moral regulation of policing

In this paper we consider some of the ethical challenges inherent in the regulation of discretionary police power. Discretion is central to police policy and practice, but it also provides a level of freedom that opens up the space for injustice and inequity, and this is seen most vividly in recent debates about unfairness and racial profiling in the distribution and experience of police stops in the US and UK. How to regulate discretionary power is a challenging question, and this is especially so in the context of practices like stop-and-search/stop-and-frisk. The ability to stop people in the street and question them is central to policing as it is understood in many liberal democracies, but under conditions of unfairness and questionable efficacy – when the application of this particular police power appears unethical as well as ineffective – one can reasonably ask whether the power should be dropped or curtailed, and if curtailed, how this would work in practice

Trust and legitimacy across Europe: a FIDUCIA report on comparative public attitudes towards legal authority

FIDUCIA (New European Crimes and Trust-based Policy) seeks to shed light on a number of distinctively ‘new European’ criminal behaviours which have emerged in the last decade as a consequence of both technology developments and the increased mobility of populations across Europe. A key objective of FIDUCIA is to propose and proof a ‘trust-based’ policy model in relation to emerging forms of criminality – to explore the idea that public trust and institutional legitimacy are important for the social regulation of the trafficking of human beings, the trafficking of goods, the criminalisation of migration and ethnic minorities, and cybercrimes. In this paper we detail levels of trust and legitimacy in the 26 countries, drawing on data from Round 5 of the European Social Survey. We also conduct a sensitivity analysis that investigates the effect of a lack of measurement equivalence on national estimates

Does government intervention in the small-firm credit market help economic performance?

The guaranteed lending programs of the Small Business Administration (SBA) are large and growing rapidly. The SBA’s fiscal year 2008 performance budget calls for $25 billion in guaranteed loans for small businesses—a new record for the agency. Some critics of SBA programs suggest they do not help small businesses or overall economic performance. Other critics suggest that these programs unfairly benefit the financial institutions that participate in SBA’s guaranteed lending programs. While very little serious empirical evidence exists on whether the net economic impact of the SBA’s guaranteed lending programs is positive or negative, a few recent studies provide some insight into the question. In general, they suggest a small positive impact of the SBA’s programs on economic performance. However, the results are very tentative and further research is needed to declare a more definitive position. We provide a general overview of the SBA’s guaranteed lending programs and summarize the results of these studies.Small Business Administration ; Small business - Finance ; Economic development