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991.
Robert F. Nau 《Journal of Risk and Uncertainty》1995,10(1):71-91
This article explores the extent to which a decision maker's probabilities can be measured separately from his/her utilities by observing his/her acceptance of small monetary gambles. Only a partial separation is achieved: the acceptable gambles are partitioned into a set of belief gambles, which reveals probabilities distorted by marginal utilities for money, and a set of preference gambles, which reveals utilities reciprocally distorted by marginal utilities for money. However, the information in these gambles still enables us to solve the decision maker's problem: his/her utility-maximizing decision is the one that avoids arbitrage (i.e., incoherence or Dutch books). 相似文献
992.
Drawing households and other living spaces in the process of assessment and psychotherapy 总被引:1,自引:1,他引:0
This paper introduces a drawing technique developed by the author for use in the assessment and treatment of individuals and families. The client is invited to draw a floor plan of his or her home or apartment, or an aerial view of un outdoor area. The drawing is then discussed and considered as a means of understanding critical elements of the experience of life space. The material derived is discussed from the eerspectives of family systems, psychodynamic, and abuse treatment theories, with special reference to notions of family structure, boundary, the self, and memory. Emphasis is placed on the actual physical layout of the home, as well as the subjective experience of it. Applications of the drawing technique for exploring memories are illustrated. Case examples are presented from clinical trials with children and adults in residential treatment, inpatient, and outpatient settings.The Heller Financial Corporation generously supports the development of household and spatial drawings for treatment and prevention. A version of this paper was presented at the 43rd Annual Meeting of the American Association of Psychiatric Services for Children, New Orleans, February 26, 1992. The author wishes to thank Robert B. Bloom, Ph.D., Excutive Director of JCB, for supporting the development of ideas and techniques discribed in this paper. 相似文献
993.
Suppose that social welfare function f satisfies the Pareto condition and has complete and transitive values. On a domain satisfying the free quadruple property, if the outcome set X has m< outcomes, then the set of pairs of distinct alternatives on which f satisfies both independence and nondictatorship contains at most the fraction 2/m of all pairs. On a domain satisfying the free six-tuple property, if X is a subset of Euclidean space then the set of pairs on which f satisfies both independence and nondictatorship has Lebesgue measure zero.Campbell's research was financed by the National Science Foundation, grant SES 9209039. 相似文献
994.
James M. Robins 《Lifetime data analysis》1995,1(3):241-254
Consider a randomized trial in which time to the occurrence of a particular disease, say pneumocystis pneumonia in an AIDS trial or breast cancer in a mammographic screening trial, is the failure time of primary interest. Suppose that time to disease is subject to informative censoring by the minimum of time to death, loss to and end of follow-up. In such a trial, the censoring time is observed for all study subjects, including failures. In the presence of informative censoring, it is not possible to consistently estimate the effect of treatment on time to disease without imposing additional non-identifiable assumptions. The goals of this paper are to specify two non-identifiable assumptions that allow one to test for and estimate an effect of treatment on time to disease in the presence of informative censoring. In a companion paper (Robins, 1995), we provide consistent and reasonably efficient semiparametric estimators for the treatment effect under these assumptions. In this paper we largely restrict attention to testing. We propose tests that, like standard weighted-log-rank tests, are asymptotically distribution-free -level tests under the null hypothesis of no causal effect of treatment on time to disease whenever the censoring and failure distributions are conditionally independent given treatment arm. However, our tests remain asymptotically distribution-free -level tests in the presence of informative censoring provided either of our assumptions are true. In contrast, a weighted log-rank test will be an -level test in the presence of informative censoring only if (1) one of our two non-identifiable assumptions hold, and (2) the distribution of time to censoring is the same in the two treatment arms. We also extend our methods to studies of the effect of a treatment on the evolution over time of the mean of a repeated measures outcome, such as CD-4 count. 相似文献
995.
A controlled exit-poll experiment on Election Day (November3, 1992) shows that refusals to answer questions and other evasiveforms of responding were significantly lower when respondentswere given a self-administered "secret-ballot" questionnairethan when they were interviewed face-to-face. While there weresome suggestive interactions of this mode-of-data collectioneffect with age and sex, and with the partisan atmosphere ofthe precinct in which the interviews were conducted, they wereborderline in significance, inconsistent in pattern, or difficuitto interpret. More important, comparisons with official electionreturns (the truth) indicated that the secret-ballot techniquewas more accurate than were face-to-face interviews in estimatingthe final outcome on the most socially sensitive of three self-reportedvotes: a vote for or against a tax levy for elderly services.Using a genuine secret ballot in the tradition of the olderGallup preelection polls can thus increase the validity of self-reportsin exit polls today. 相似文献
996.
Implementing partial least squares 总被引:2,自引:0,他引:2
M. C. Denham 《Statistics and Computing》1995,5(3):191-202
Partial least squares (PLS) regression has been proposed as an alternative regression technique to more traditional approaches such as principal components regression and ridge regression. A number of algorithms have appeared in the literature which have been shown to be equivalent. Someone wishing to implement PLS regression in a programming language or within a statistical package must choose which algorithm to use. We investigate the implementation of univariate PLS algorithms within FORTRAN and the Matlab (1993) and Splus (1992) environments, comparing theoretical measures of execution speed based on flop counts with their observed execution times. We also comment on the ease with which the algorithms may be implemented in the different environments. Finally, we investigate the merits of using the orthogonal invariance of PLS regression to improve the algorithms. 相似文献
997.
Jeffrey S. Simonoff 《Statistics and Computing》1995,5(3):245-252
The standard approach to non-parametric bivariate density estimation is to use a kernel density estimator. Practical performance of this estimator is hindered by the fact that the estimator is not adaptive (in the sense that the level of smoothing is not sensitive to local properties of the density). In this paper a simple, automatic and adaptive bivariate density estimator is proposed based on the estimation of marginal and conditional densities. Asymptotic properties of the estimator are examined, and guidance to practical application of the method is given. Application to two examples illustrates the usefulness of the estimator as an exploratory tool, particularly in situations where the local behaviour of the density varies widely. The proposed estimator is also appropriate for use as a pilot estimate for an adaptive kernel estimate, since it is relatively inexpensive to calculate. 相似文献
998.
Ronald C. Wimberley 《The American Sociologist》1998,29(4):5-19
Applied sociology is basically what sociologists do for nonsociologists and sometimes for themselves. Applied sociology includes
the teaching of sociology as one of the liberating arts and sciences. It also involves the practice of sociology outside academia
in the public and private sectors. Either way, applied sociology needs support groups, and state sociological associations
need useful things to do beyond their traditional interests in academic teaching and research. Professional sociological associations,
and especially those that serve at the local, state level, can become important support groups for applied sociology. This
article suggests five types of applied sociology projects appropriate for state associations. These are volunteering applied
sociology; doing applied sociology through consulting; making the value of sociological applications more visible; identifying
applied sociology jobs for our baccalaureate, master's, and doctoral graduates; and helping to improve the socioeconomic outlook
for our academic colleagues and, in turn, ourselves. State associations provide an organizational base, proximate members,
and local opportunities for applying sociology.
Ron Wimberley, teaches sociological research methods and does research on the southern Black Belt and other topics. He also
attempts applied sociology through volunteer work, consulting, and occasional leaves from his university position. Catherine
Harris of Wake Forest University is appreciated for suggesting the topic. The author is responsible for the views expressed
in the article. 相似文献
999.
Barry V. Johnston 《The American Sociologist》1998,29(3):26-42
The history of sociology is marked by periods of theoretical pluralism and hegemony. Their interplay has resulted in the slow
and uneven development of the discipline. Today, however, bodies of theory and practice have become so diverse that many scholars
worry that sociology is in a state of disintegration. The theoretical career of Talcott Parsons provides a microcosm in which
to explore similar processes. Building on the success of The Structure of Social Action, Parsons led a movement that transformed Harvard's Department of Sociolgy into the Department of Social Relations. There
he attempted a grander, but failed synthesis in Toward A General Theory of Action. His case provides a situation in which to explore features of disciplinary integration and fragmentation. The comparison
stimulates one to fashion an informed sense of whether sociology is now facing its latest crisis or may be in the process
of decomposition as a corpus of study.
This research was supported by grants from the American Sociological Association's Fund for the Advancement of the Discipline
and by Indiana University Northwest through a sabbatical leave. 相似文献
1000.
While skilled labour migration across international borders is a phenomenon of increasing significance in the age of globalization and an important component in the production of global cities, it has not been given sufficient attention in traditional migration analyses.
Recent research has focused on institutional mechanisms regulating the patterns of skill transfer rather than the individual experience of being part of the international labour circuit. Women, in particular, have usually been relegated to the role of "trailing spouses" and are generally invisible in the migration process.
Using a questionnaire survey and in-depth interviews, this article attempts to reinstate the importance of women's roles by portraying them as active agents who adopt a range of strategies in negotiating the move and coming to terms with the transformations wrought by the move in the domains of home, work and community. It argues that skilled labour migration is a strongly gendered process, producing different sets of experiences for the men and women involved in it.
While international circulation often represents "career moves" for expatriate men, their spouses often experience a devalorization of their productive functions and a relegation to the domestic sphere. As an adaptive strategy, expatriate women often turn to the social and community sphere to reach for grounding in their lives.
The article also points to the diversity of "expatriate experiences": while "western" expatriates tend to recreate a more exclusive world by drawing on strong institutional support, "Asian" expatriates find that they have to navigate much finer social and cultural divides between themselves and the host society. 相似文献
Recent research has focused on institutional mechanisms regulating the patterns of skill transfer rather than the individual experience of being part of the international labour circuit. Women, in particular, have usually been relegated to the role of "trailing spouses" and are generally invisible in the migration process.
Using a questionnaire survey and in-depth interviews, this article attempts to reinstate the importance of women's roles by portraying them as active agents who adopt a range of strategies in negotiating the move and coming to terms with the transformations wrought by the move in the domains of home, work and community. It argues that skilled labour migration is a strongly gendered process, producing different sets of experiences for the men and women involved in it.
While international circulation often represents "career moves" for expatriate men, their spouses often experience a devalorization of their productive functions and a relegation to the domestic sphere. As an adaptive strategy, expatriate women often turn to the social and community sphere to reach for grounding in their lives.
The article also points to the diversity of "expatriate experiences": while "western" expatriates tend to recreate a more exclusive world by drawing on strong institutional support, "Asian" expatriates find that they have to navigate much finer social and cultural divides between themselves and the host society. 相似文献