Causal inferences from many experiments

The underlying statistical concept that animates empirical strategies for extracting causal inferences from observational data is that observational data may be adjusted to resemble data that might have originated from a randomized experiment. This idea has driven the literature on matching methods. We explore an un-mined idea for making causal inferences with observational data – that any given observational study may contain a large number of indistinguishably balanced matched designs. We demonstrate how the absence of a unique best solution presents an opportunity for greater information retrieval in causal inference analysis based on the principle that many solutions teach us more about a given scientific hypothesis than a single study and improves our discernment with observational studies. The implementation can be achieved by integrating the statistical theories and models within a computational optimization framework that embodies the statistical foundations and reasoning.     

Applying RE-AIM to evaluate two community-based programs designed to improve access to eye care for those at high-risk for glaucoma

IntroductionGlaucoma is a leading cause of vision loss and blindness in the U.S. Risk factors include African American race, older age, family history of glaucoma, and diabetes. This paper describes the evaluation of a mobile eye health and a telemedicine program designed to improve access to eye care among people at high-risk for glaucoma.MethodsThe RE-AIM (reach, efficacy, adoption, implementation, and maintenance) evaluation framework was used to harmonize indicators. Both programs provided community-based eye health education and eye services related to glaucoma detection and care. Each program reported data on participants and community partners. An external evaluator conducted site visit interviews with program staff and community partners. Quantitative and qualitative data were integrated and analyzed using the RE-AIM dimensions.DiscussionBy targeting high-risk populations and providing comprehensive eye exams, both programs detected a large proportion of new glaucoma-related cases (17–19%) – a much larger proportion than that found in the general population (<2%). The educational intervention increased glaucoma knowledge; evidence that it led people to seek eye care was inconclusive.ConclusionsEvaluation findings from the mobile eye health program and the telemedicine program may provide useful information for wider implementation in public health clinics and in optometrist clinics located in retail outlets.     

Multiscale Bayesian state-space model for Granger causality analysis of brain signal

Modelling time-varying and frequency-specific relationships between two brain signals is becoming an essential methodological tool to answer theoretical questions in experimental neuroscience. In this article, we propose to estimate a frequency Granger causality statistic that may vary in time in order to evaluate the functional connections between two brain regions during a task. We use for that purpose an adaptive Kalman filter type of estimator of a linear Gaussian vector autoregressive model with coefficients evolving over time. The estimation procedure is achieved through variational Bayesian approximation and is extended for multiple trials. This Bayesian State Space (BSS) model provides a dynamical Granger-causality statistic that is quite natural. We propose to extend the BSS model to include the à trous Haar decomposition. This wavelet-based forecasting method is based on a multiscale resolution decomposition of the signal using the redundant à trous wavelet transform and allows us to capture short- and long-range dependencies between signals. Equally importantly it allows us to derive the desired dynamical and frequency-specific Granger-causality statistic. The application of these models to intracranial local field potential data recorded during a psychological experimental task shows the complex frequency-based cross-talk between amygdala and medial orbito-frontal cortex.     

Digital survivance and Trickster humor: exploring visual and digital Indigenous epistemologies in the #NoDAPL movement

ABSTRACT

The decolonizing turn in the humanities and social sciences calls for scholarship that analyzes social media practices through the lens of Indigenous epistemologies. In this article, we model the ways that Indigenous epistemologies might contribute to theories of social media practices as we explore ways that the digital image can drive identification with and engagement in political acts. The article analyzes social media tropes circulated across various platforms among Indigenous communities and allies in relation to the #NoDAPL movement. We argue that attempting to analyze Native American traditions through Western theory will only work towards colonizing these Indigenous texts. Thus, whereas we employ insights from digital and visual methods of analysis (Highfield, T., & Leaver, T. (2016). Instagrammatics and digital methods: Studying visual social media, from selfies and GIFs to memes and emoji. Communication Research and Practice, 2(1), 47–62), we also highlight the strategic use of humor in the visual materials shared through various social media platforms utilizing the framework of the Trickster. We argue that the visual and digital phenomena we studied might best be understood as a form of digital survivance, drawing upon Anishinaabe scholar Gerald Vizenor [(1994). Manifest manners: Postindian warriors of survivance. Hanover, CT: Wesleyan University Press]. term ‘survivance’ as a portmanteau that combines ‘survival’ and ‘resistance’ in its characterization of Indigenous storytelling traditions. Whereas centering the Indigenous figure of the Trickster might suggest that social media has failed to live up to its promises, this epistemological approach also explains the hope that Indigenous communities hold in uniting via social media for what has been and continues to be a long-term battle for sovereignty and for the protection of the earth and all of its beings.     

浅析英语用典修辞及其在经贸英语中的汉译

本文谨对英语典故的类型作一阐述，同时对经贸英语中典故的翻译作一简述。     

Farming without a recipe: Wisconsin graziers and new directions for agricultural science

From 2005 through 2008, we undertook a participatory research project involving graziers from 8 farms in Southern Wisconsin, all of whom practice management intensive grazing. We used semi-structured interviews and participant observation during research and field days to investigate graziers’ engagement with university research. Grazing farms demonstrate rich variability and individuality as a result of their position within a number of biophysical and social contexts. Graziers emphasized the importance of finding ways to work with the variables of their specific context, rather than trying to control that variability. This effort entails the development and use of local knowledge, as graziers respond to the idiosyncrasies of their farms. It also leads graziers to reject mainstream agricultural research that has produced formulas for agricultural uniformity. The picture of grazing that emerged from our interviews leads us to propose the search for agroecological principles and agroecological tools, embedded in context, as an alternative to conventional research. We argue that this proposal speaks to the greater conundrum of how to relate the general knowledge of science to the place-specific, experience-based knowledge of grass-based farmers.     

关于西医院校中医学教学方法的几点思考

针对西医院校中医教学的自身特点，我们改进教学方法，引导学生学会中医的思维方法，增加传统文化元素，激发学生学习中医的兴趣和探究中医的热情，构建终身学习的理念。     

Local Control Strategy: Simple Analyses of Air Pollution Data Can Reveal Heterogeneity in Longevity Outcomes

Claims from observational studies that use traditional model specification searches often fail to replicate, partially because the available data tend to be biased. There is an urgent need for an alternative statistical analysis strategy, that is not only simple and easily understood but also is more likely to give reliable insights when the available data have not been designed and balanced. The alternative strategy known as local control first generates local, nonparametric effect‐size estimates (fair treatment comparisons) and only then asks whether the observed variation in these local estimates can be predicted from potential confounding factors. Here, we illustrate application of local control to a historical air pollution data set describing a “natural experiment” initiated by the federal Clean Air Act Amendments of 1970. Our reanalysis reveals subgroup heterogeneity in the effects of air quality regulation on elderly longevity (one size does not fit all), and we show that this heterogeneity is largely explained by socioeconomic and environmental confounders other than air quality.     

Changing a Leopard's Spots: A New Research Direction for Organizational Culture in the Operations Management Field

Operations Management (OM) research on organizational culture has to change to be able to inform practice. Currently, organizational culture research in OM is largely confined to narrow topical and methodological niches and culture is most frequently used as an explanatory variable in quantitative, survey‐based research. We argue that the relegation of culture to this niche is due to self‐imposed methodological blinders that hobble the OM field. We then present four research imperatives to reinvigorate organizational culture research within our field. We urge OM scholars to view culture as a dynamic concept that can be influenced, to adopt alternative methods, to use non‐traditional data sources, and to rethink assumptions about dependent variables. We also identify gaps in the current knowledge and new research questions for the OM domain. We conclude that the field of OM could greatly expand its understanding of organizational culture and in so doing greatly improve business practice, but that to do so will require a change in the culture of the operations management research community.     

Private violence/private transport: the role of means of transport in women’s mobility to escape from domestic violence in England and Wales

ABSTRACT

This article highlights a gendered and forced mobility which has been under-recognised in the literature on mobility. It explores the hidden relocations of women (often with children) due to intimate partner abuse; presenting findings from mixed methods research on women’s journeys to escape domestic violence, including analysis of over 80 journey segments made by 20 women within England and Wales, and from abroad. Focusing on means of transport, the research found that under a third of journey segments were made by public transport, and these tended to be longer distances; that journeys by disabled women were more likely to be by private transport, and that journeys from rural areas were more likely to be with the assistance of others. Thematic analysis of interviews at different stages of women’s journeys is used to explore their experiences of different means of transport in terms of degrees of control and agency, in terms of losing or retaining personal possessions on the move; and in highlighting the role of others’ assistance in compounding or counteracting the implications of abuse. Women’s domestic violence journeys are thereby contextualised within wider mobilities research, uncovering the inequalities and implications of this hidden internal displacement in the UK.