Australia Farewell: Predictors of Emigration in the 2000s

The factors leading individuals to immigrate to developed contexts are widely studied, but comparatively less is known about those who emigrate from them. In this paper, we use data from a nationally representative cohort of Australian adults to develop longitudinal measures of emigration and to assess how social ties and individual economic position predict emigration. Cox proportional hazards models indicate that the propensity to emigrate is particularly pronounced for those with relatively little social connectedness in Australia. Specifically, our results show that first-generation Australians, especially those with relatively short durations in the country, have substantially higher emigration rates than later-generation Australians. Similarly, having a partner with deeper generational roots in Australia strongly reduces the likelihood to emigrate. At the same time, our analysis also shows that economic position matters, with the not employed having higher risks of emigration. Perhaps most interestingly, estimates from our models reveal that those with university degrees are much more likely to emigrate than individuals with lower levels of education, a finding that is true for both first- and later-generation Australians.     

Estimating models based on Markov jump processes given fragmented observation series

We consider the problem of estimating the rate matrix governing a finite-state Markov jump process given a number of fragmented time series. We propose to concatenate the observed series and to employ the emerging non-Markov process for estimation. We describe the bias arising if standard methods for Markov processes are used for the concatenated process, and provide a post-processing method to correct for this bias. This method applies to discrete-time Markov chains and to more general models based on Markov jump processes where the underlying state process is not observed directly. This is demonstrated in detail for a Markov switching model. We provide applications to simulated time series and to financial market data, where estimators resulting from maximum likelihood methods and Markov chain Monte Carlo sampling are improved using the presented correction.     

An empirical study on the relationship between perceived employability and employee performance

Despite the growing attention to employability in the era of job insecurity, there have been a limited number of empirical studies regarding the positive effect of employees’ perceived employability (PE) on performance. The purpose of this study is to examine the relationship between PE and three domains of employee performance: in-role, adaptive, and extra-role. This study also tests the moderating effect of the perceived quality of employment on these relationships. To test our hypotheses, we surveyed 334 employees and their 37 immediate supervisors working for an organization in South Korea. We utilized official performance ratings and supervisors’ ratings to measure the three domains of performance. The results show that PE is positively related to in-role, adaptive, and extra-role performance. An interaction between PE and the perceived quality of employment on extra-role performance is also evident. Implications for research and human resource development practices will be provided.     

Prevalence and reasons for Juul use among college students

Abstract

Objective: Examine Juul use patterns, sociodemographic and personal factors associated with Juul use, and reasons for Juul initiation and current use, among college students. Participants: Convenience sample of 371 undergraduates at a large university in the southeast; recruited April 2018. Methods: Cross-sectional design using an online survey. Logistic regression identified the personal risk factors for current use. Results: Over 80% of participants recognized Juul; 36% reported ever use and 21% past 30-day use. Significant risk factors for current Juul use were: male, White/non-Hispanic, lower undergraduate, and current cigarette smoker. Current Juul users chose ease of use and lack of a bad smell as reasons for use. Ever Juul users most commonly endorsed curiosity and use by friends as reasons for trying Juul. Conclusions: Given the propensity for nicotine addiction among youth and young adults, rates of Juul use are alarming and warrant immediate intervention.     

Some results on the injective chromatic number of?graphs

A k-coloring of a graph G=(V,E) is a mapping c:V??{1,2,??,k}. The coloring c is injective if, for every vertex v??V, all the neighbors of v are assigned with distinct colors. The injective chromatic number ?? _i (G) of G is the smallest k such that G has an injective k-coloring. In this paper, we prove that every K ₄-minor free graph G with maximum degree ????1 has $\chi_{i}(G)\le \lceil \frac{3}{2}\Delta\rceil$ . Moreover, some related results and open problems are given.     

The compensation of non-executive directors: rationale,form, and findings

Corporate governance guidelines in many countries do not specify the determinants of non-executive director compensation and the empirical evidence has only briefly and indirectly addressed this issue. We show that this question is fundamentally complex because (a) whilst the roles of non-executive directors are relatively well stated, their actual contributions remain unclear, (b) governance codes have not discussed the ways in which non-executive directors should undertake their roles and (c) non-executive director contribution may be unobservable. As a result, their efforts, contribution and/or performance are difficult to measure. Nevertheless, we find the literature related to non-executive directors strongly supportive of some sort of remuneration that is a function of performance and effort to align non-executive directors with their duties and make boards more efficient in undertaking their duties.     

Some simple robust estimators of normal distribution tail percentiles and their properties

Applications often require estimation of extreme percentile of a distribution. For example, in high temperature low cycle fatigue testing one wishes to estimate the cycles to failure associated with a low failure probability. Frequently, the available data suggest a normal distribution as a reasonable model for that part of the distribution that contains the percentile of interest, even though it may be inadequate as an overall representation. For such situations we seek estimators that are simple to apply by non-statisticians, robust to deviations from normality, and resistant to contamination by outliers in the right tail. We are especially concerned with situations that involve small sample sizes and extrapolation beyond the data.     

Youth Development: On the Path Toward Professionalization

Youth development in the United States is making a transition from social movement to emerging profession. This article marks the path of this transition; charts achievements in developing core competencies and skill standards, training and education programs, career ladders, evaluations, and public awareness; and suggests the next steps in staff development that managers of nonprofit youth and human service organizations should consider.