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排序方式: 共有258条查询结果,搜索用时 15 毫秒
91.
Cheng Zhiming Mishra Vinod Nielsen Ingrid Smyth Russell Wang Ben Zhe 《Social indicators research》2017,130(1):1-8
Partial order methodologies appear as advantageous tools to disclose evaluative trends and developments for time series as, e.g., the fragile states index (FSI). The present study focuses on the variations in the 12 individual indicators of the FSI over the years 2011–2015. The FSI includes in total 178 states and the present study analyzes both the full set of states and a subset comprising only the 28 European Union states. Clear trends are observed. Thus, on a global scale the primary importance of brain drain apparently is turned into group grievance whereas on the European scale the development discloses the increased problems associated with the increasing number of refugees and migrants as well as the declining economic situation in some states. Further the study discloses a series of so-called peculiar states, i.e., states where single indicators values are markedly higher or lower than expected when comparing to the “main stream” of indicator values for the states studied. In all cases the findings were substantiated and verified by available literature. 相似文献
92.
Søren Feodor Nielsen 《Scandinavian Journal of Statistics》1997,24(2):261-274
In Rubin (1976) the missing at random (MAR) and missing completely at random (MCAR) conditions are discussed. It is concluded that the MAR condition allows one to ignore the missing data mechanism when doing likelihood or Bayesian inference but also that the stronger MCAR condition is in some sense the weakest generally sufficient condition allowing (conditional) frequentist inference while ignoring the missing data mechanism. In this paper it is shown that (a slightly strengthened version of) the MAR condition is sufficient to yield ordinary large sample results for estimators and test statistics and thus may be used for (asymptotic) frequentist inference. 相似文献
93.
A prominent school health issue in the United States is the use of backpacks, however, there is a paucity of literature on the effectiveness of backpack safety programs. The purpose of this paper is to describe a school-based backpack health promotion program: Backpack Intelligence, report on its effectiveness, and suggest avenues for future research. Three-hundred-seventy-two 6th and 7th grade students participated in the program which was integrated into their physical education curriculum. Of those students, 242 completed post-education surveys to assess its effectiveness. Pre-education, 44% reported that their backpack was uncomfortable to carry, and 61% reported two or more warning signs that their backpack was too heavy. Only 57% wore their backpack properly and less than half organized the contents in their backpack correctly. Post-education, 63% reported the program worthwhile. Forty-two percent changed the way they used their backpack, and 93% felt knowledgeable about backpack safety, a 24% increase. Both grade and gender differences were found. Areas identified in the literature as fruitful for future research were suggested. Until we have definitive research on the link between backpack use and injury, interventions may be imperfect, but as a society we are compelled to safeguard the health of our children. 相似文献
94.
Leila Janani Mohammad Ali Mansournia Kazem Mohammad Mahmood Mahmoodi Kamran Mehrabani 《Journal of Statistical Computation and Simulation》2017,87(4):640-651
Relative risks (RRs) are often considered as preferred measures of association in randomized controlled trials especially when the binary outcome of interest is common. To directly estimate RRs, log-binomial regression has been recommended. Although log-binomial regression is a special case of generalized linear models, it does not respect the natural parameter constraints, and maximum likelihood estimation is often subject to numerical instability that leads to convergence problems. Alternative methods for solving log-binomial regression convergence problems have been proposed. A Bayesian approach also was introduced, but the comparison between this method and frequentist methods has not been fully explored. We compared five frequentist and one Bayesian methods for estimating RRs under a variety of scenario. Based on our simulation study, there is not a method that can perform well based on different statistical properties, but COPY 1000 and modified log-Poisson regression can be considered in practice. 相似文献
95.
Theory and Decision - We discuss Herzberg’s (Theory Decis 78(2):319–337, 2015) treatment of linear aggregation for profiles of infinitely many finitely additive probabilities and... 相似文献
96.
John T. Nielsen 《Population and environment》1989,11(2):123-139
Arrivals of new immigrants and the secondary migration of other immigrants to the Los Angeles area are estimated to be as many as 180,000 each year in the 1980s. The Southern California Association of Governments found three-quarters of the immigrants were low-income minorities who are more likely to live in overcrowded enclaves and pay disproportionately high rents. Other data suggest that immigrants—many of them undocumented and Hispanic—are both victims of and contributors to the housing crisis.Although aggravated by immigration, Los Angeles' low-cost housing ills stem from broader national, social and economic trends: gentrification and other commercial conversion of low-cost housing, stagnating federal housing aid, and diminished tax and loan incentives. Skyrocketing costs have dropped the rate of home ownership well below the national average, forcing more people to rent. Condominium conversions, costly safety regulations, rent controls and successful no-growth movements also have contributed to Los Angeles' housing crisis. 相似文献
97.
Jan M. Hoem Dan Madien Jørgen Løgreen Nielsen Else-Marie Ohlsen Hans Oluf Hansen Bo Rennermalm 《Demography》1981,18(2):231-244
This paper reports the outcome of an exercise in curve fitting to annual sets of Danish age-specific fertility rates for the years 1962 to 1971 by means of least squares. Functions fitted were a cubic spline, the Hadwiger and Coale-Trussell functions, the gamma and beta densities, two versions of a polynomial, and two of Brass's relational procedures, as well as the Gompertz curve. The spline function fitted all curves far better than any of the others. The Coale-Trussell procedure and gamma density were about equal, followed by the Hadwiger function. All of these functions fit the data well. One of the polynomials fit reasonably well, but the rest of the functions were less accurate. 相似文献
98.
Cunningham Solveig A. Beckles Gloria L. Nielsen Jannie 《Population research and policy review》2022,41(4):1699-1723
Population Research and Policy Review - We investigate associations between a diabetes diagnosis and financial and instrumental transfers between parents and adult children. Data are from... 相似文献
99.
This article analyzes the benefits and ethical dilemmas of going back and continuing to write about the troupe of drag queens
featured in our book, Drag Queens at the 801 Cabaret. The benefits include providing the drag queens the opportunity to revise and add to the stories we told about them and,
through deepening friendships, changing the balance of power among us. Challenges include dealing with responses to the book,
including those of family members, and conflicts over the royalties we shared with the troupe. Despite the pitfalls, going
back contributes to public sociology by continuing conversations about research findings. 相似文献
100.
Richard P. Nielsen 《Long Range Planning》1983,16(6):74-81
This article examines relationships between strategic planning and consensus building with external groups and constituencies. Methods for consensus building with external groups during strategic planning and implementation are discussed and five cases from different economic and political sectors are examined in conjunction with the principles considered. 相似文献