Probability Distributions.- Linear Models for Regression.- Linear Models for Classification.- Neural Networks.- Kernel Methods.- Sparse Kernel Machines.- Graphical Models.- Mixture Models and EM.- Approximate Inference.- Sampling Methods.- Continuous Latent Variables.- Sequential Data.- Combining Models.

Pattern Recognition and Machine Learning

The Structural Transformation of the Public Sphere: An Inquiry into a Category of Bourgeois Society

Originally published in Contemporary Psychology: APA Review of Books, 1994, Vol 39(2), 225. Reviews the book, The Nature and Origins of Mass Opinion by John Zaller (1992). The author's commendable effort to specify a model of mass opinion formation offers readers an introduction to the prevailing vi

The Nature and Origins of Mass Opinion.

This paper addresses the scope for more integrated general analysis of diversity in science, technology and society. It proposes a framework recognizing three necessary but individually insufficient properties of diversity. Based on 10 quality criteria, it suggests a general quantitative non-parametric diversity heuristic. This allows the systematic exploration of diversity under different perspectives, including divergent conceptions of relevant attributes and contrasting weightings on different diversity properties. It is shown how this heuristic may be used to explore different possible trade-offs between diversity and other aspects of interest, including portfolio interactions. The resulting approach offers a way to be more systematic and transparent in the treatment of scientific and technological diversity in a range of fields, including conservation management, research governance, energy policy and sustainable innovation.

A General Framework for Analysing Diversity in Science, Technology and Society

A Virtuous Circle: Political Communications in Postindustrial Societies. Pippa Norris. New York: Cambridge University Press, 2000. 398 pp. $59.95 hbk. $21.95 pbk. The main finding of Pippa Norris's study is that exposure to the news media is positively related to citizens' levels of political knowledge, trust, and participation, even after controlling for demographics, attitudinal factors, and cultural differences. Although various positive contributions of exposure to news media already have been documented in other research, never was the amount of evidence as monumental as in this book. Norris analyzed European Community, Eurobarometer, European Election and Post-election, British Campaign Panel, U.S. National Election, and Pew Center for the People and the Press surveys, providing individual and aggregate level, over-time and cross-sectional evidence supporting her virtuous media thesis. The book is set up as a challenge to "conventional wisdom" or "unquestioned orthodoxy" of media malaise theories that argue that "exposure to the news media discourages learning about politics, erodes trust in political leaders and government institutions, and dampens political mobilization." The problem is that there is a huge gap between the abundance of glib charges and the scarcity of empirical evidence of negative effects of news media. Consequently, Norris mostly relies on Michael Robinson's long ago retracted videomalaise claim and strays away from her main line of theorizing by reviewing studies that deal with the issues well outside the scope of her own study, such as effects of framing news stories, political advertising, and television entertainment. Findings of negative media effects in contexts other than elections and those tapping more specific types of media content and their particular features remain unchallenged by the Norris study. Norris acknowledges that "we need to compare the effects of variance in the media messages so that we can see whether people who consistently use one distinctive source (such as crime-focused local TV news) differ from those who use others (such as rightwing talk radio)" and that "our measures of media habits are often diffuse and imprecise," but she is still restricted in her research to measures of frequency of general newspaper and television news use. Nevertheless, Norris urges us to stopblaming the news media for political problems and instead to direct our attention to "the problems themselves." This call, without showing that media in many of their specific content characteristics or structures are not a part of problems that extend beyond voting and political campaigning, seems premature at best. However, Norris's study makes a significant contribution to communication research by most convincingly showing that the news media may be an important part of solutions to some of the social ills. …

A Virtuous Circle: Political Communications in Postindustrial Societies

Some fear that personalised communication can lead to information cocoons or filter bubbles. For instance, a personalised news website could give more prominence to conservative or liberal media items, based on the (assumed) political interests of the user. As a result, users may encounter only a limited range of political ideas. We synthesise empirical research on the extent and effects of self-selected personalisation, where people actively choose which content they receive, and pre-selected personalisation, where algorithms personalise content for users without any deliberate user choice. We conclude that at present there is little empirical evidence that warrants any worries about filter bubbles.

https://papers.ssrn.com/sol3/Delivery.cfm/SSRN_ID2758126_code1896949.pdf?abstractid=2758126&type=2

Should We Worry About Filter Bubbles

Prompted by the ongoing development of content personalization by social networks and mainstream news brands, and recent debates about balancing algorithmic and editorial selection, this study expl

My Friends, Editors, Algorithms, and I: Examining audience attitudes to news selection

News media play a key role in informing young citizens about politics and cultivating a sense of political efficacy. Online news media, in particular, are expected to have a positive impact due to their interactivity and new opportunities to share and discuss information. This study analyzes the impact of online and offline news media use on the growth in internal efficacy among adolescents, based on data we collected in a three-wave panel survey in the Netherlands (N = 729). Additionally, we test the impact of internal efficacy on turnout using a fourth wave of the same sample (N = 612). The results show that while newspaper reading has the strongest effects among traditional news sources, actively participating in the communication process of political information online has the strongest impact on internal efficacy. Internal efficacy in turn is found to be a significant predictor of first-time voters. The article concludes with a discussion of media use as a pathway to political participation through internal political efficacy.

/pdf/pathway-to-political-participation-the-influence-of-online-58m9tc8oou.pdf

Pathway to Political Participation: The Influence of Online and Offline News Media on Internal Efficacy and Turnout of First-Time Voters

How to study media diversity has become a major concern in today’s media landscape. Many expect that algorithmic filtering and a shift of audiences from legacy media to new intermediaries decrease ...

/pdf/the-unified-framework-of-media-diversity-a-systematic-4bnd9pv2gt.pdf

The Unified Framework of Media Diversity: A Systematic Literature Review

This study investigates the dynamics of the reciprocal influence of political knowledge and attentive news use. News media are an important source for political information and contribute to political learning. Yet, this process is optimized with increasing levels of pre-existing knowledge about the political world. In extant literature, mutual interdependence is often suggested, but empirical proof is scarce. We propose to conceptualize the relationship of knowledge and news use as an upward spiral. The model is tested on data from a three-wave panel survey among 888 adolescents using growth curve modeling. The results support the model of a spiral of political learning. Interestingly, the influence of political knowledge on news use is estimated to be higher than the other way round.

/pdf/spiral-of-political-learning-the-reciprocal-relationship-of-2hwog2w3bk.pdf

Judith Moeller

Papers

Should We Worry About Filter Bubbles

My Friends, Editors, Algorithms, and I: Examining audience attitudes to news selection

Pathway to Political Participation: The Influence of Online and Offline News Media on Internal Efficacy and Turnout of First-Time Voters

The Unified Framework of Media Diversity: A Systematic Literature Review

Spiral of Political Learning: The Reciprocal Relationship of News Media Use and Political Knowledge Among Adolescents