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121.
Jean‐Marie Dufour Mohamed Taamouti 《Econometrica : journal of the Econometric Society》2005,73(4):1351-1365
It is well known that standard asymptotic theory is not applicable or is very unreliable in models with identification problems or weak instruments. One possible way out consists of using a variant of the Anderson–Rubin ((1949), AR) procedure. The latter allows one to build exact tests and confidence sets only for the full vector of the coefficients of the endogenous explanatory variables in a structural equation, but not for individual coefficients. This problem may in principle be overcome by using projection methods (Dufour (1997), Dufour and Jasiak (2001)). At first sight, however, this technique requires the application of costly numerical algorithms. In this paper, we give a general necessary and sufficient condition that allows one to check whether an AR‐type confidence set is bounded. Furthermore, we provide an analytic solution to the problem of building projection‐based confidence sets from AR‐type confidence sets. The latter involves the geometric properties of “quadrics” and can be viewed as an extension of usual confidence intervals and ellipsoids. Only least squares techniques are needed to build the confidence intervals. 相似文献
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Anders Blok Maria D. Lindstrm Marie L. Meilvang Inge K. Pedersen 《Symbolic Interaction》2019,42(4):588-617
Ecological approaches to professional work, authority, and regulation have seen a resurgence in the sociology of professions, as epitomized in the linked ecologies framework of Andrew Abbott. Alongside this resurgence comes a renewed attention to the way symbolic and material boundaries within and between professions, as well as between professional, university, and political institutions, come to be defined, negotiated, and changed as part of ongoing professional projects. Building on and comparing case studies set in Denmark into three emerging professional “proto‐jurisdictions”—of water‐related climate adaptation, lifestyle disease prevention, and innovation management—this article identifies three key modes of interprofessional boundary work important for such projects. In doing so, it grounds Abbott's meso‐level framework of linked ecologies in more situated accounts of workplace‐level boundary interaction, by reconnecting to a wider tradition of symbolic interactionist studies of professions. 相似文献
125.
Considerable evidence has documented that the elderly are more religious and that religiosity is associated with better health and lower mortality. Yet, little is known about the reverse role of life expectancy or proximity to death, as opposed to age, for religiosity. This paper provides evidence for the distinct role of expected remaining life years for the importance of religion in individuals’ lives. We combine individual survey response data for more than 300,000 individuals from 95 countries over the period 1994–2014 with information from period life tables. Contrary to wide-held beliefs, religiosity decreases with greater expected proximity to death. The findings have important implications regarding the consequences of population aging for religiosity and associated outcomes. 相似文献
126.
The theory of work adjustment (TWA; R. V. Dawis & L. H. Lofquist, 1984; L. H. Lofquist & R. V. Dawis, 1969, 1991) is useful in addressing the career counseling needs of retirees who want to continue working but who need to explore their career choices before settling on a new occupation or job. This article examines some of the challenges that midlife and older adults face as they plan postretirement careers. Information about TWA and a case example are provided to assist counselors in understanding how TWA can be applied to retirement career counseling. 相似文献
127.
The evidence is clear that rural older people in most nations are less physically healthy than their urban counterparts. Research suggests that such differences may be due more to lifestyle characteristics, biological factors and environmental conditions than to access to, or utilization of, medical services. Utilizing a statewide sample of Idaho residents this study compares the characteristics of those people associated with a disease prevention/health maintenance model and those associated with the medical or disease oriented model. Results show some clear differences in characteristics between people utilizing the two models of health care. 相似文献
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Students of industrial sociology have noted theoretical and empirical inadequacies in dual-economy and dual-labor market theories, and have called for revisions in these perspectives. A single case, McDonald's in the fast-food industry, is analyzed as a vehicle towards reformulation. It is argued that, as a center retailer, McDonald's contains elements of both primary and secondary labor markets, and that this dualism is a partial function of its economic structure that contains both core and peripheral elements. The job hierarchies, hiring practices, compensation, training, and control systems all evidence elements of both primary and secondary markets. The external validity of these findings is explored, and implications for dual-economy and dual-labor market theories and research are developed. 相似文献
130.
Jean Marie Hubert van Engelshoven 《Long Range Planning》1991,24(6):17-24
In the last decade there has been a radical change in public attitudes to the environment—a change initiated by a young ‘green’ movement, which, years ago, was trying to make its real concern heard in both government and industry. Governments were seen to have little concern for the environment, and industry was typecast in the role of the dirty polluter. Most significantly, the three parties were seen as sitting in separate camps. Over the years, however, we in industry were forced to think our actions through towards their logical environmental conclusion. We were forced to develop an environmental appreciation which we did not have some time ago. In turn, the environmentalists and governments started to realize that industry is an essential player in society, and that balances can be struck which benefit both society and the environment. We have much to be grateful to these green pioneers for, even if we sometimes find that difficult to admit. This process resulted in industry, government and the ‘green’ movement learning to talk to each other. Dialogue, is most important if we are to ensure the continuation of a world fir for our children and grandchildren to grow up in. Dialogue ensures that the tide of change continues. In that process business should become part of the environmental solution, the provider of the resources needed to improve our world for the better rather than being portrayed as the problem. 相似文献