A relational technique for estimating the age‐specific mortality pattern from grouped data

This paper presents a new technique of expanding an abridged life table. This technique is a non‐parametric one, which relates the probabilities of dying of the abridged table to those of a standard complete table. In order to evaluate the accuracy of the new technique we use it, as well as two other techniques, for expanding empirical abridged data sets. According to the results of our calculations the new method proves very efficient in producing complete life tables from grouped data, in many cases producing more accurate results than the other two methods in spite of its simplicity.     

Age patterns of mortality for older women: An analysis using the age‐specific rate of mortality change with age

The age‐specific rate of mortality change with age, defined by k(x) = d Inμ(x)/dx, where μ(x) is the age‐specific death rate at exact age x, is estimated for middle and old ages in ten selected populations that are considered to have relatively accurate age data. For females in each of the study populations, k(x) follows a bell‐shaped curve that usually peaks around age 75. In some of the populations, the age pattern of k(x) for males is confounded with substantial cohort variations, which seem to reflect long‐term impacts of their World War I experiences.

Among the mathematical models proposed by Gompertz, Makeham, Perks and Beard, only the Perks model is consistent with the bell‐shaped pattern of k(x). It is shown that, if the risk of death for every individual follows the Makeham equation and if the individual frailty is gamma‐distributed, then the age‐specific death rate follows the Perks equation.     

Dingo media? The persistence of the “trial by media” frame in popular,media, and academic evaluations of the Azaria Chamberlain case

In the bulk of popular, media, and scholarly discourse on Azaria Chamberlain’s disappearance there is overwhelming consensus that the sensationalist reporting of the event convicted parents Michael and Lindy of their daughter’s murder outside official court processes. In feminist scholarship in particular, the infant’s disappearance in August 1980 has been read according to a “trial by media” frame. This frame persists despite altered perspectives about the role of the Australian public whose punitive and collectively hostile response to a media-driven hysteria has been replaced with the portrait of a kinder and more compassionate nation. The objectives of this article are threefold: to demonstrate the persistence of the trial by media frame in popular, media, and academic discourse; to consider assumptions of a monolithic and hostile media; and by examining a previously unanalysed archive to suggest that these arguments overlook the existence of sympathetic voices in mainstream media as well as the dialogic connection between media and counter-publics mutually supporting the Chamberlains’ bid for innocence. This research offers an alternative view to scholarship on a landmark event in Australian history and has broader implications for the way we view the media in trial by media situations.     

Who should invest in specific training?

We study experimentally whether employers or workers should invest in specific training. Workers have an alternative trading opportunity that takes the form of either an outside option or a threat point. Theory predicts that with outside options, employers have (weakly) better investment incentives than workers do and should therefore be the investing party. With threat points, employers and workers are predicted to invest the same. Our results are, by and large, in line with these predictions. Due to offsetting inefficiencies in the bargaining stage, however, realized inefficiencies are remarkably similar across the different situations considered.

A nine‐parameter version of the Heligman‐Pollard formula

In this paper we outline and evaluate a nine‐parameter version of the Heligman‐Pollard formula. In our applications, using mortality data for five European countries we found that this version provides closer fits to empirical mortality data than the classical eight‐parameter formula, thus eliminating a source of systematic error in this latter formula.     

Rape,storytelling and social media: how Twitter interrupted the news media’s ability to construct collective memory

Abstract

This study, using the Mary Kay LeTourneau interview on ABC’s 20/20 television program, investigates how social media coupled with citizens’ voices interact with mainstream media in the telling of a story and the construction of collective memory. Grounded in discourse analysis, this research examines the 20/20 story and accompanying Twitter conversations to understand how dominant and feminist ideologies about gender, rape, sexual violence, sexuality, and love are presented and (re)articulated in these texts. In doing so, this study considers how a newly opened public sphere via social media may have the capabilities to influence our collective memories and remove some of this long-held power away from traditional mainstream media.     

Feminine or feminist? Women’s media leadership

This paper presents a small-scale qualitative case study of five women’s experiences of leadership roles in Irish media industries. Relational Leadership Theory is used to examine whether there is a gendered dimension to women’s leadership and to explore why women’s participation in leadership has not resulted in significant feminist gains or changes to media organisations. The article finds that: the women saw their leadership as relational and simultaneously as socially constructed in a gendered manner. Moreover, the women led organisational change towards greater gender equality in the norms of media work. However, while the women’s leadership was relational and feminine, it was not necessarily feminist; it did not aim to generate systemic changes within the gendering of the media as an institution. The changes that the women wrought incorporated women into a system of production that remained nonetheless masculinist.     

Persistent age distributions for an age‐structured two‐sex population model*

In this paper we formulate an age‐structured two‐sex population model which takes into account a monogamous marriage rule and the duration of marriage. We are mainly concerned with the existence of exponential solutions with a persistent age distribution. First we provide a semigroup method to deal with the time‐evolution problem of our two‐sex population model. Next, by constructing a fixed point mapping, we prove the existence of exponential solutions under homogeneity conditions.     

Neo‐Nomadism: A Theory of Post‐Identitarian Mobility in the Global Age

This article focuses on a theoretical discussion about the interrelations between global hypermobility and subjectivity formation. Based on ethnographic fieldwork among expatriates that circulate through global circuits of countercultural lifestyle, the study initially evinces the cultural and conceptual significance of global nomadism. It then detects conceptual limitations for the investigation of fluidic and metamorphic formations in global studies. Through a dialogue between the anthropology of nomadism and philosophy of nomadology, the article then seeks to integrate tropes of fluidity, rootlessness and aesthetic reflexivity into an ideal‐type of postidentitarian mobility (neo‐nomadism), a device for investigating the cultural effects of hypermobility on self, identity and sociality. It includes methodological notes on nomadic ethnography. The article concludes that the neo‐nomad is both a phenomenon and a concept that allows us to rethink models of subjectivity formation in globalization.     

Parental media socialization and educational attainment: Resource or disadvantage?

This article analyzes the long-term effects of parental media socialization on children's educational attainment. Data on 8316 individuals from 3257 families in the Netherlands is used to estimate hierarchical models that distinguish between family-specific (socialization) and individual-level effects. The study reveals that parental reading and television socialization plays a meaningful role in predicting children's success in education. Whereas parental time spent viewing television is disadvantageous for a child's educational career, parental reading intensity enhances educational success. Moreover, not only does media exposure play a relevant role, the content of parental media consumption also matters. Parents who prefer highbrow literature benefit their children's educational career, whereas a preference for watching popular TV programs is disadvantageous for a child's educational success. Next to the parental example of media consumption, media guidance provided by parents is scrutinized. Results indicate that parent-child interactions on reading positively affect children's educational attainment.     

A behavioral two‐sex marriage model

In this paper we propose a particular marriage model, i.e., a model for the number of marriages for each age combination as a function of the vectors of the number of single men and women in each age group. The model is based on Dagsvik (2000) where it is demonstrated that a general type of matching behavior imply, under specific assumptions about the distribution of the preferences of the women and men, a convenient expression for the corresponding marriage model.

Data from the Norwegian Population Register for nine years are applied to estimate the model. We subsequently test the hypothesis that, apart from a random “noise”; component, the age‐specific parameters of the model change over time according to a common trend. We find that the hypothesis is not rejected by our data.     

Mixed estimation of old‐age mortality

The estimation of the mortality of the “oldest old”; is subject to considerable random error, but important prior information exists that can be used to make the estimates more robust. Mixed estimation is a method of incorporating auxiliary information into the statistical estimation of linear models. We extend the method to cover general maximum likelihood estimation, and show that the mixed estimator can be represented approximately as a weighted average of the purely data based estimator and the auxiliary estimator. The methods can be applied to the analysis of the old‐age mortality via logistic and Poisson regression. A major advantage of the mixed estimator is the simplicity with which it can incorporate partial prior information. Moreover, no special software is needed in the fitting. We show how the targeting methods of Coale and Kisker can be represented as mixed estimation in a natural way that is more flexible than the original proposal. We also derive empirical estimates of the target information based on pooled data from several countries with high quality data. We consider the mortality of Finland at ages 80 +, study the reliability of the evidence of mortality crossover, and derive estimates of life expectancy at age 100.     

Multistate life‐tables and regression models

A survey is given of the use of modern statistical techniques in event history analysis, and in particular in the study of multi‐state life‐tables in demography. Emphasis is placed on the interplay between partial likelihood and nonparametric maximum likelihood based methods, a) when analysing semi‐Markov models or models with repeated spells, and b) in frailty models for inobservable heterogeneity.     

Bridging the Gap: Overcoming Data Difficulties During 40 Years of Measuring Well-Being in The Netherlands

For more than 40 years the Netherlands Institute for Social Research|SCP has studied the quality of life of the Dutch population. A characteristic element of that research is the use of time series. However, maintaining a time series over such a long period is not easy. All manner of problems arise, such as indicators no longer being relevant (who still has a black and white television?) or the changing importance that is attached to particular topics (sport is more important today than it was in 1974). The method of data collection can also change. In this article we take the perspective of a specific measurement to look at the changes that have taken place over the last 40 years and how those changes have been accommodated. We do this using the SCP Life Situation Index, which measures the objective quality of life of Dutch citizens. The conclusion is that it is possible to construct a long-term time series, but that it is not always possible to interpret changes from year to year: the perspective has to focus primarily on long-term developments.     

Sex-specific patterns and differences in dementia and Alzheimer’s disease using informatics approaches

ABSTRACT

The National Institutes of Health Office of Research on Women’s Health recently highlighted the critical need for explicitly addressing sex differences in biomedical research, including Alzheimer’s disease and dementia. The purpose of our study was to perform a sex-stratified analysis of cognitive impairment using diverse medical, clinical, and genetic factors of unprecedented scale and scope by applying informatics approaches to three large Alzheimer’s databases. Analyses suggested females were 1.5 times more likely than males to have a documented diagnosis of probable Alzheimer’s disease, and several other factors fell along sex-specific lines and were possibly associated with severity of cognitive impairment.     

The multistate life table with duration‐dependence

A method for generalizing the multistate, or increment‐decrement, life table to include rates which depend upon duration of exposure to risk, as well as upon age, is proposed. The method is built upon the linear approximation, called the linear integration hypothesis, developed mainly by Rogers and his colleagues. Although the use of rates indexed by duration categories leads to a substantial increase in the state space of the model, it is possible to arrange the rates in such a way that matrices to be inverted are no larger than those encountered in the usual multistate life table. In the more general approach it is possible to derive several new summary indices of the life‐table cohort's history, such as the mean and median time in current status, at any age. The method is illustrated using a simple four‐state marital‐status model which has appeared often in the literature; here, rates of divorce and widowhood vary by duration of marriage as well as age.     

The solution of time‐dependent population models

We analyze the dynamics of age‐structured population renewal when vital rates make a transition in a finite time interval from arbitrary initial values to any specified final values. The general solution to the renewal equation in such cases is obtained. This solution describes the birth sequence explicitly, and also leads to a general formula for population momentum. We show that the duration of the transition determines the complexity of the solution for the birth sequence. For transitions that are completed in a time smaller than the maximum age of reproduction, we show that the classical Lotka solution found in every textbook also applies, with a small modification, to the time‐dependent case. Our results substantially extend previous work that has often focused on instantaneous transitions or on slow and infinitely persistent change in vital rates.