Beware of Greeks? Some aspects of intercultural communication in international training programs for educators

The last decade has witnessed a growing number of international exchange and training programs for educators, particularly in the areas of social studies. Dramatic changes in Central and Eastern Europe made the western, particularly the American, experience in civic education and teaching for democracy more and more desirable. In many instances, instructors from the US and western Europe have acted as experts in those programs. However, there are observations that challenge the success of the ‘West as Expert model.’ In the described study, a group of Russian faculty and administrators of teacher‐training universities was probed on questions regarding their attitudes toward foreign and native teachers and instructors. The results of the study demonstrate that, despite unanimous support for international education, all respondents, regardless of the length of their professional experience, demonstrated a slight preference for Russian teachers and instructors compared with foreign teachers and instructors. This preference is a result of differences in school cultures, determined mainly by specific features of every school, local cultural traditions, and prejudices and misconceptions of the local population.     

A Multistate model of fecundability and sterility

This paper develops a multistate hazards model for estimating fecundability and sterility from data on waiting times to conception. Important features of the model include separate sterile and nonsterile states, a distinction between preexisting sterility and sterility that begins after initiation of exposure, and log-normally distributed fecundability among nonsterile couples. Application of the model to data on first birth intervals from Taiwan, Sri Lanka, and the Amish shows that heterogeneity in fecundability is statistically significant at most ages, but that preexisting sterility and new sterility are unimportant before age 40. These results suggest that sterility may not be an important determinant of natural fertility until later reproductive ages.     

Age-specific mortality trends in France and Italy since 1900: Period and cohort effects

Although France and Italy currently exhibit very similar expectations of life, their mortality patterns by age and sex are not the same. The differences were much greater at the beginning of the century than they are now. Graphical presentation of the data since 1900 by age, period and birth cohort is used to explore in detail the differences in trends and to bring out, in particular, differences between the two countries in period and cohort effects. In addition to providing more details on well-known period effects — the secular decline in mortality in both countries (with Italy largely ‘catching up’ with France), and the immediate effects of the world wars — similarities and differences in cohort effects are also apparent. The two countries exhibit clear differences not only in terms of immediate casualties of the wars, but also in terms of the long-term impact of unfavourable wartime living conditions on the cohorts most affected.     

Survival of related individuals: An extension of some fundamental results of heterogeneity analysis

Many ideas in the analysis of heterogeneous mortality are based on the relationship between individual and observed hazard rates. This connection is established with the help of conditional averaging procedure: The observed risk of death at age x is calculated among those who survive this age. The analogy of this result for bivariate survival model with correlated individual hazards is derived. In the case of correlated frailty model the parametric specification of the mean, variance and correlation coefficient of the bivariate frailty distribution among survivors is obtained. The relationship between local association measure and the characteristics of the bivariate frailty distribution among survivors is established.     

Exchange programs for educators: American and Russian perspectives

International exchange and training programs play a significant role in the development of international cooperation between educators from different nations. More and more teachers and school administrators participate in exchange programs and implement new curricular and instructional practices in their institutions. This paper presents findings of a phenomenological interpretive case study of the impact of international exchange programs for educators on their participants’ pedagogical practices, social status and professional careers. The study was conducted in 2005 in the US and Russia. Through observations and in‐depth interviews with 35 informants, the author compares the perception of exchange programs and their outcomes for American and Russian alumni. The findings demonstrate differences and similarities in participants’ perspectives on their roles in international programs and on the application of program outcomes.     

Survival of related individuals: an extension of some fundamental results of heterogeneity analysis

"Many ideas in the analysis of heterogeneous mortality are based on the relationship between individual and observed hazard rates. This connection is established with the help of conditional averaging procedure: The observed risk of death at age x is calculated among those who survive this age. The analogy of this result for bivariate survival model with correlated individual hazards is derived. In the case of correlated frailty model the parametric specification of the mean, variance and correlation coefficient of the bivariate frailty distribution among survivors is obtained. The relationship between local association measure and the characteristics of the bivariate frailty distribution among survivors is established." (SUMMARY IN FRE)     

Study of the bivariate survival data using frailty models based on Lévy processes

Frailty models allow us to take into account the non-observable inhomogeneity of individual hazard functions. Although models with time-independent frailty have been intensively studied over the last decades and a wide range of applications in survival analysis have been found, the studies based on the models with time-dependent frailty are relatively rare. In this paper, we formulate and prove two propositions related to the identifiability of the bivariate survival models with frailty given by a nonnegative bivariate Lévy process. We discuss parametric and semiparametric procedures for estimating unknown parameters and baseline hazard functions. Numerical experiments with simulated and real data illustrate these procedures. The statements of the propositions can be easily extended to the multivariate case.

     

Heterogeneity's Ruses: Some Surprising Effects of Selection on Population Dynamics

As a cohort of people, animals, or machines ages, the individuals at highest risk tend to die or exit first. This differential selection can produce patterns of mortality for the population as a whole that are surprisingly different from the patterns for subpopulations or individuals. Naive acceptance of observed population patterns may lead to erroneous policy recommendations if an intervention depends on the response of individuals. Furthermore, because patterns at the individual level may be simpler than composite population patterns, both theoretical and empirical research may be unnecessarily complicated by failure to recognize the effects of heterogeneity.     

Targeting lifesaving: Demographic linkages between population structure and life expectancy

Life expectancy in a heterogeneous population can be increased by lowering mortality rates or by averting deaths at different ages, from different causes, or for different groups, as well as by changing the proportions of individuals in various risk groups, perhaps by altering the transition rates between groups. Understanding how such changes in population structure affect life expectancy is useful in evaluating alternative lifesaving policies.