Quantiles via moments Machado, José A.F.; Santos Silva, J.M.C.
Journal of econometrics,
11/2019, Letnik:
213, Številka:
1
Journal Article
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We study the conditions under which it is possible to estimate regression quantiles by estimating conditional means. The advantage of this approach is that it allows the use of methods that are only ...valid in the estimation of conditional means, while still providing information on how the regressors affect the entire conditional distribution. The methods we propose are not meant to replace the well-established quantile regression estimator, but provide an additional tool that can allow the estimation of regression quantiles in settings where otherwise that would be difficult or even impossible. We consider two settings in which our approach can be particularly useful: panel data models with individual effects and models with endogenous explanatory variables. Besides presenting the estimator and establishing the regularity conditions needed for valid inference, we perform a small simulation experiment, present two simple illustrative applications, and discuss possible extensions.
The relationship between religious majorities and minorities in the Middle East is often construed as one of domination versus powerlessness. While this may indeed be the case, to claim that this is ...only or always so is to give a simplified picture of a complex reality. Such a description lays emphasis on the challenges faced by the minorities, while overlooking their astonishing ability to mobilize internal and external resources to meet these challenges. Through the study of strategies of domination, resilience, and accommodation among both Muslim and non-Muslim minorities, this volume throws into relief the inherently dynamic character of a relationship which is increasingly influenced by global events and global connections.
The end of treatment is known to be a particularly challenging time for many cancer survivors as they transition to coping with their condition independently. They may engage in health behaviours, ...such as implementing drastic dietary changes to manage the side effects of treatment they have undergone or as a way to assuage their anxiety. Understanding cancer survivors' heightened preoccupation with healthy eating is therefore fundamental to our understanding of the psychological phenomenology of cancer. This study explored how people who have developed a heightened preoccupation with healthy eating after a cancer diagnosis make sense of this change. Eight participants were recruited through social media. They each engaged in a semi-structured interview over Zoom concerning their changed relationship with food following cancer. Their accounts were then analysed using interpretative phenomenological analysis (IPA). The article focuses on four group experiential themes arising from the analysis: Open and Enlightened About Food, Becoming a Better Me?, Developing a New Passion for Nutrition, and Becoming Consumed by Food. The themes that arose from the analysis speak to the experience of becoming a 'better' person from having lived through cancer and developed a new relationship with food. Instead of seeing illness as a loss, several of the participants reported a positive shift linked to having developed an interest in healthy eating, something which became central to their identity. However, others experienced their new engagement with healthy eating as a preoccupation that engulfed them. These findings are discussed in light of existing theory and research, and their clinical implications are outlined. Areas for future research are also suggested.
This article is a slight revision of a keynote lecture presented at the 15th International Congress of Qualitative Inquiry in Illinois in 2019. It argues that to experiment and create the “new” in ...post qualitative, post humanist, and other “new” forms of inquiry invented for the 21st century, social science researchers may well need to refuse conventional humanist social science research methodologies created for the problems of previous centuries.
This article revisits the concept and practice of tokenism in collective child participation, querying whether it is accurate to describe it as ‘non-participation’ and assessing the extent to which ...it may offer a useful and sometimes necessary step on the journey to more respectful and meaningful engagement with children. It concludes by reflecting on the quality of the feedback given to children and the role that improved feedback might play in addressing the challenge of tokenism.
This article synthesizes knowledge on the role of relationships and key macroand micro-contexts - poverty, racism, families, communities, schools, and peers - in supporting and/or undermining the ...healthy development of children and youth, using a relational developmental systems framework. Relationships with parents, siblings, peers, caregivers, and teachers are explored in the context of early care and childhood settings, schools, classrooms, and school-based interventions. Additional contextual factors include; chronic stress, institutionalized racism, stereotype threat, and racial identity. A companion article focuses on how the human brain develops, and the major constructs that define human development, the constructive nature of development, and the opportunities for resilience. Human development occurs through reciprocal coactions between the individual and their contexts and culture, with relationships as the key drivers. Relationships and contexts, along with how children appraise and interpret them, can be risks and assets for healthy learning and development, and their influence can be seen across generations and can produce intra- as well as intergenerational assets and risks. This knowledge about the individual's responsiveness to context and experience has both positive and negative implications across early childhood, adolescence and into adulthood. Sensitive periods for brain growth and development are considered within the contextual factors that influence development including; parental responsiveness and attunement, intentional skill development, mindfulness, reciprocal interactions, adversity, trauma, and enriching opportunities. The accumulated knowledge on human development and the power of context and culture can inform child-serving systems that support positive adaptations, resilience, learning, health, and well-being.
The end-of-life trajectory of cancer patients in palliative care (PC) elicits an anticipatory grief (AG) process in family caregivers (FCs). Although widely recognized, AG lacks conceptual ...clarification. This study aims to qualitatively explore the experience of FCs of patients with terminal cancer to identify the core characteristics and the specific adaptive challenges related to AG in the context of end-of-life caregiving. Data were collected through in-depth semi-structured interviews conducted in a clinical sample of 26 FCs of cancer patients in PC. Findings from thematic analysis suggest that the AG experience is characterized by traumatic distress from being exposed to life-threatening conditions and the separation distress induced by loss anticipation and current relational losses, challenging the FCs to long-term emotional regulation effort demands. These results contribute to the conceptualization of AG and may inform intervention programs for the main challenges the FCs face when adjusting to loss during end-of-life caregiving.
This study illustrates an exploratory approach based on a Multiway Factor Analysis (MFA) to estimate rapidity of change in complex urban systems, based on “fast” and “slow” variables. The proposed ...methodology was applied to 18 socioeconomic indicators of long‐term (1960–2010) transformations in 115 municipalities of Athens’ metropolitan area (Greece), including demography, land‐use/planning, and urban form and functions. Athens was regarded as a dynamic urban area with diversified structures and functions at the local scale, expanding through a self‐organized pattern rather than a centralized planning strategy. Athens’ urban system was described using nine supplementary (topographic and territorial) variables and 30 independent indicators assessing the local context in recent times. Exploratory data analysis found an increasing connectedness and redundancy among socioeconomic indicators during the phase of largest urban expansion (1960–1990). Only the rate of population growth was classified as a “fast” variable for all five decades investigated. The overall rapidity of change was higher in 1960–1970, 1980–1990, and 2000–2010, decades that coincided with specific phases of urban expansion driven by migration inflow, second‐home suburbanization, and Olympic games, respectively. Rapidity of change was high for functional indicators during all five decades studied, while demography indicators changed more rapidly in the first three decades and land‐use/planning indicators in the last two decades. Rapidity of change was highest in peri‐urban municipalities with a highly diversified economic structure dominated by industry. Our methodology provides a comprehensive overview of the transformations of a complex urban system, quantifying low‐level indicators that are rarely assessed in the mainstream literature on urban studies. These results may contribute to design policies addressing complexity and promoting resilience in expanding metropolitan areas.
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