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Comparable lifetime migration relationships are estimated for Mexico for 1950, 1960, and 1970. Moreover, migration flows from each state to every other state are separately examined for each year. A number of significant changes over time are evident in the responsiveness of Mexican internal migrants to various socioeconomic stimuli, and appreciable differences are also evident across space. Moreover, a threshold is observed such that up to about 340 miles higher origin earnings deter migration, but beyond this distance higher earnings actually encourage migration. 相似文献
43.
Cary A. Greenwood 《Journal of Public Relations Research》2013,25(4):456-476
This article introduces the concept of using Charles Darwin's (1859/1979) evolutionary theory as the metatheory for conceptualizing public relations thought. It examines the state of public relations theory development and explores theories that have been proposed as metatheories for the field, including systems theory, complexity theory, and symmetrical/Excellence theory. It also explores the tenets of evolutionary theory that have relevance for public relations theory, including social intelligence, Machiavellian intelligence, cheater detection, cooperation, reciprocity, and reciprocal altruism. It then makes the case for the role that evolutionary theory could play as a metatheory in the further development of public relations theory. 相似文献
44.
Suppose we observe i.i.d. copies of X, C, Y, where X is a counting process, C is a censoring process talcing only values 0 and 1, and Y is a covariate process. Assume that the intensity process of X is of the form C(s)a(s, Y(s)) with a unknown, but that the distribution of X, C, Y is unspecified otherwise. McKeague and Utikal proposed an estimator for the doubly cumulative hazard f f a(s, y) ds dy and determined its asymptotic distribution. We show that the estimator is regular and efficient in the sense of a Hájek-Inagaki convolution theorem for partially specified models. 相似文献
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"This article is concerned with geographically indirect immigration to Canada over the period 1968-1988. A geographically indirect immigrant is an individual legally admitted to Canada whose country of last permanent residence differs from country of birth. Records maintained by Employment and Immigration Canada on every immigrant legally admitted over the period were used in the study. Relative to geographically direct immigrants, geographically indirect immigrants tend to be older, more educated, and more highly skilled. Moreover, if they were not born in an English or French speaking country, indirect immigrants are more likely to speak English and/or French capably than direct migrants born in such countries. The study also contains bivariate logit estimates of a model of geographically indirect Canadian immigration. This model suggests that indirect migrants tend to be influenced by personal characteristics (age, sex, marital status, occupation, language ability), as well as by various characteristics of the country of birth (distance from Canada, income level, political conditions)." 相似文献
48.
Leighton Gabriella R. M. Bishop Jacqueline M. O’Riain M. Justin Broadfield Joleen Meröndun Justin Avery Graham Avery D. Margaret Serieys Laurel E. K. 《Urban Ecosystems》2020,23(3):569-583
Urban Ecosystems - Urbanisation radically changes habitats and alters available resources. Populations of large, highly mobile species are often extirpated at the urban-wildland interface, while... 相似文献
49.
This panel-data study concerns the incidence of newly diagnosed tuberculosis (TB) in specific U.S. metropolitan areas among
immigrants and, in turn, the possible transmission of the disease to the native-born population of these same metropolitan
areas. The study includes 50 U.S. Metropolitan Statistical Areas as annual observations, 1993–2007. We find that a 10% increase
in the number of high-incidence immigrants results in a 2.87% increase in TB among the foreign-born population, and that a
10% increase in the number of foreign-born TB cases increases the number of new TB cases among the native-born by 1.11%. The
study concludes with a benefit/cost analysis of the societal cost of TB and suggests that testing all immigrants for TB would
be a cost-effective method to limit the amount of TB that enters U.S. from abroad, thus limiting the transmission to both
the foreign- and native-born populations. 相似文献
50.
The measures of gastrointestinal and cardiovascular health in The Standard Shiftwork Index (SSI; Barton, Costa, Smith, Spelten, Totterdell, and Folkard, 1995) purport to measure the frequency of 19 related symptoms using a 4-point rating scale, with response categories expressed in terms of a relative frequency: 'almost never', 'quite seldom', 'quite often', and 'almost always'. The present pilot study examined the relationship between frequency ratings of 11 gastrointestinal and 8 cardiovascular symptoms made on the SSI 4-point scale, and ratings of the same symptoms made on an alternative 9-point rating scale, which had response categories that were expressed in terms of an absolute value of symptom frequency (e.g. 'once a week'). Results obtained from a sample of 56 non-shiftworkers showed that the correlations between the two response formats were not high for any of the 11 gastrointestinal or 8 cardiovascular symptoms. Three of the relationships were non-significant. In addition, substantial variability in the interpretation of the response categories was detected between symptom items pertaining to both the gastrointestinal and cardiovascular subscales. The implications of these findings are discussed in relation to the current system of scoring individual symptom items, and the current aims within shiftwork research. 相似文献