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21.
MOMENT ESTIMATION IN THE CLASS OF BISEXUAL BRANCHING PROCESSES WITH POPULATION–SIZE DEPENDENT MATING
Miguel González Manuel Mota Alfonso Ramos 《Australian & New Zealand Journal of Statistics》2007,49(1):37-50
This paper concerns the estimation of the offspring mean vector, the covariance matrix and the growth rate in the class of bisexual branching processes with population‐size dependent mating. For the proposed estimators, some unconditional moments and some conditioned to non‐extinction are determined and asymptotic properties are established. Confidence intervals are obtained and, as illustration, a simulation example is given. 相似文献
22.
Ramos H 《International migration (Geneva, Switzerland)》1991,29(4):601-616
"The purpose of this work is to explore the advantages and disadvantages of... Mexican immigrant workers for the economy and the political and cultural status quo of the United States. The Mexican immigrant workers pose a dilemma for the United States. On the one hand, the United States needs them for a better functioning of its economy. On the other, the Mexican immigrant workers represent a racial, cultural and political challenge to the American 'establishment'.... Given the magnitude of the problem which the Mexican immigrants represent and the intense debate surrounding it, the cheap labour they represent for the economy of the United States and the unsolved conflicts this provokes, are fertile ground for the analysis of the economic, political and cultural interests competing for the degree of flexibility or the amount of policing the Mexican border should have." (SUMMARY IN ENG AND FRE) 相似文献
23.
At many Canadian universities it is now common to publicly acknowledge Indigenous lands, treaties, and peoples. Yet, this practice has yet to be considered as a subject of scholarly inquiry. How does this practice vary and why? In this paper we describe the content and practice of acknowledgment, linking this content to treaty relationships (or lack thereof). We show that acknowledgment tends to be one of five general types: of land and title (British Columbia), of specific treaties and political relationships (Prairies), of multiculturalism and heterogeneity (Ontario), of no practice (most of Quebec), and of people, territory, and openness to doing more (Atlantic). Based on these results, we conclude that the fluidity of acknowledgment as a practice, including changing meanings depending on the positionality of the acknowledger, need to be taken into account. Plusieurs universités Canadien pratique une reconnaissance des territoires, des traités, et des peoples autochtone en publique. Cette pratique, cependant, n'a jamais été considérée comme une enquête savante. Dans ce projet nous regardons comment les reconnaissances varie par institution et pourquoi. Nous trouvons qu'il y a un lien entre le contenu des reconnaissances et les relations traité. On démontre cinq forme des reconnaissances: territoire et titre (Colombie britannique); traité spécifique and les relations politiques (Prairies); multiculturalisme et hétérogénéité (Ontario); l'absence (la majorité du Québec); et des peoples, territoire et volonté a plus faire (Atlantique). Nous concluons que la fluidité de la reconnaissance, comme pratique, est fluide et doit prendre en considération la position de la personne qui le fait. 相似文献
24.
Despite well documented high levels of socioeconomic inequalities, health gradients by socioeconomic status (SES) in contemporary China have been reported to be limited. Using data from the 2010–2012 China Family Panel Studies, we reexamine associations between three sets of SES—human capital, material conditions, and political capital—and self-rated health among Chinese adults 18–70 years old, capitalizing on anchoring vignette data to adjust for reporting heterogeneity. We find strong evidence of substantial variations in reporting behaviors by education, cognition, and family wealth but not by family income or political capital. Failing to correct for reporting heterogeneity can bias the estimates of SES gradients in self-rated health as much as nearly 40 %. After vignette adjustment, we find significantly positive associations of education, family income, wealth, and political capital with self-rated health. Individuals’ cognitive capacity, however, does not predict self-rated health. 相似文献
25.
Susana Villas-Boas Albertina Lima Oliveira Natália Ramos Inmaculada Montero 《Journal of intergenerational relationships》2019,17(1):42-57
This study examines the Quality of Life (QOL) of 374 individuals from a generational perspective. Using a nonexperimental design and multiple regression analyses, the results indicated that social support is the highest preditor of QOL for all generations. As for specific generational groups, in addition to social support, income was observed as a QOL predictor for young adults; marital status was a significant predictor for the middle-aged adults, and income emerged as the important predictor for older adults. These results offer valuable insights for the planning and implementation of Intergenerational Education Programs with the aim of increasing QOL across adulthood. 相似文献
26.
Romualdo Ramos Stefan Güntert Rebecca Brauchli Georg Bauer Theo Wehner Oliver Hämmig 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2016,27(2):790-809
The literature on the health-promoting effects of community work has primarily dealt with the population in retirement age, yet the vast majority of volunteers are people still in the workforce. The aim of this study is to observe the relationship between volunteering and health within the context of working life, considering paid work conditions and motives to volunteer as moderating variables. We conducted an online survey with a sample of Swiss workers employed in different industries. Results show that volunteers with self-determined motives (but not with controlled motives) report lower levels of stress and burnout than non-volunteers. Moreover, volunteers in general (regardless of the quality of motivation) report higher levels of work engagement and well-being. Analyses further reveal an interaction effect for burnout and stress, where the difference between self-determined volunteers and non-volunteers becomes larger with unfavorable working conditions at their paid job, hinting at potential compensatory effects. Implications for future research and the voluntary sector are discussed. 相似文献
27.
Spritzer DT Rohde LA Benzano DB Laranjeira RR Pinsky I Zaleski M Caetano R Tavares H 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2011,27(4):649-661
The objectives of the study are: (a) to provide the first prevalence estimates of pathological gambling among Brazilian adolescents
using an age-specific instrument in a nationally representative sample; (b) to investigate the extent to which adolescents
participate in gambling activities in a developing country; and (c) to correlate different levels of gambling behavior with
demographic variables. Multistage cluster sampling selected 3,007 individuals over 14 years of age from Brazilian household
population. A total of 661 participants were between 14 and 17 years old. The Lie/Bet Questionnaire and the DSM-IV-MR-J were
used for assessing problem and pathological gambling. 2.8% scored positive on the screening questionnaire, while 1.6% were
classified as problem and pathological gamblers. Factors associated with problem and pathological gambling were male sex,
not currently studying and considering religion as not important. Less than 4 months elapsed between the age of regular gambling
involvement and the first gambling problem. Prevalence rates were quite similar from recent studies which used nationally
representative samples. The association of problem and pathological gambling with male sex, school drop-out and low religiosity
supports the Problem Behavior Theory. The fast progression to problem gambling adds evidence that adolescents may be more
vulnerable to the effects of gambling. 相似文献
28.
Ana Isabel Vieira Ana Vanessa Ramos Luís Manuel Cavalheiro Patrícia Almeida Dália Nogueira Elisabeth Reis Maria Vânia Nunes Alexandre Castro-Caldas 《Journal of Nonverbal Behavior》2016,40(4):363-377
Social touch is essential for physical and emotional well-being. However, different meanings can be attributed to physical contact during social interactions and may generate bonding or avoidant behaviors. This personal and unique experience is not usually taken into account in health and social care services. The aim of this study is to produce a valid and reliable European Portuguese version of the Social Touch Questionnaire (STQ, Wilhelm et al. in Biol Psychol 58:181–202, 2001. doi: 10.1016/S0301-0511(01)00113-2). The STQ is a self-report questionnaire for adolescents and adults measuring behaviors and attitudes towards social touch. The original version was translated into European Portuguese using a forward-back translation process and its feasibility was examined. To evaluate the psychometric properties, a total of 242 Portuguese university students participated in the study (21.3 ± 3.8 years). The STQ was considered feasible, showed adequate internal consistency (Cronbach’s α = .734), and the test–retest correlation with the STQ items demonstrated a high concordance between the tests over a two-week interval (ICC = .990; n = 50). Validity tests were performed, comparing the total score of the STQ with that of the anxiety and avoidance subscales of the Social Interaction and Performance Anxiety and Avoidance Scale (SIPAAS). A very significant conceptual convergence was confirmed between the STQ and with the SIPAAS-Anxiety (r = .64; p < .0001) and with the SIPAAS-Avoidance (r = .59; p < .0001). The exploratory factor analysis, with Promax rotation, revealed 3 factors: dislike of physical touch, liking of familiar physical touch and liking of public physical touch (Cronbach’s alphas ranged from .68 to .75). Psychometric properties confirmed the adaptation of the STQ to the Portuguese culture. It is a reliable and valid self-report questionnaire and it appears to be a useful tool to assess behaviors and attitudes towards social touch. 相似文献
29.
Philip O. Buck Paul A. Toro Melanie A. Ramos 《Analyses of Social Issues and Public Policy》2004,4(1):151-171
Media and professional interest in homelessness represent important sources of data that may be useful in understanding broader societal factors influencing this pressing social issue. The present study examined the volume and content of coverage of homelessness in four major newspapers and the professional literature indexed in PsycINFO over the past 30 years. Media coverage showed a steep increase during the mid-1980s, a steady decline throughout the late 1980s and into the 1990s, and a plateau since the mid-1990s. Professional coverage demonstrated a less pronounced and delayed pattern of growth, with no sign of decline during the past decade. Content analysis of 574 newspaper articles revealed a sympathetic focus on deinstitutionalization and other structural causes of homelessness during the period of increasing coverage in the mid-1980s, as well as positive media coverage in terms of an emphasis on critical programs and services during more recent years. Content analysis of 324 professional journal articles showed that deficits and deviant characteristics of homeless people were discussed to a significantly greater extent than the structural causes of homelessness over the entire 30-year time period. Possible interactions among media coverage, professional interest, public opinion, the prevalence of homelessness, and policy initiatives are discussed. 相似文献
30.
Elssy Bonilla de Ramos 《Journal of popular culture》1980,14(3):486-496
Over the last few decades radio has becomeone of the primary means of mass communication in Latin America, able to reach euen the remotest rural populations because of the transistor. Colombia, where ninety-one percent of the homes in the seven largest cities have at least one radio, has also been heavily impacted by this modern technological phenomenon, Elssy Bonilla de Ramos focuses on radio advertising as a means of characterizing the relationship between radio and the Colombian economic sector. She argues that private companies who own most of the country's stations and networks influence programming and advertising in order to widely promote products which they produce. She believes that in many cases these products are not necessary to the consumers'well-being but are advertised in a way to make them more desirable. The authorgives a brief history of commercial radio in Colombia during the last fifty years, stating that early in its development programming underwent significant changes in order to capture an expanded audience. Comedy, sports, news, soap operas, classical and popular music, and quiz shows soon dominated the airways to the exclusion of programming that could play a role in the political, social and economic development of the country. She contends that industries that owned radio were intent on training for consumption and she uses a week's sample of programming and advertising to illustrate her point. 相似文献