Insights and recommendations for recruitment and retention of low socio-economic parents with overweight children

Low socio-economic groups are typically difficult to recruit and retain in health research, which makes it difficult to investigate their health-related beliefs and behaviours. Low socio-economic parents with overweight or obese children took part in a longitudinal qualitative child obesity study over 12?months. These parents’ views of and recommendations for appropriate recruitment and retention strategies are reported. Their interpretations and suggestions are considered in the light of the difficulties that were experienced in designing the study to meet their needs and the approaches that were found to be more effective in achieving and maintaining a viable study cohort. Relevant aspects of recruitment included remuneration, recruitment locations and the use of appropriate weight-related terminology. Retention factors included protocol flexibility, ongoing remuneration and learning opportunities. Barriers to ongoing participation are also discussed. Suggestions are provided for future qualitative research with low socio-economic families.     

Combining Parallel and Exploratory Factor Analysis in Identifying Relationship Scales in Secondary Data

Common methods used in the literature to identify factors within exploratory factor analysis have been shown to be potentially problematic. This brief report illustrates a state of the art approach in identifying factor structure by adding parallel analysis before exploratory factor analysis. Parallel analysis enables researchers to have a high degree of confidence of the number of factors to extract before exploratory factor analysis. The procedure is illustrated by using items from the National Survey of Families and Households used to identify relationship scales.     

A Scenario‐Based Evaluation of the Middle East Respiratory Syndrome Coronavirus and the Hajj

Between April 2012 and June 2014, 820 laboratory‐confirmed cases of the Middle East respiratory syndrome coronavirus (MERS‐CoV) have been reported in the Arabian Peninsula, Europe, North Africa, Southeast Asia, the Middle East, and the United States. The observed epidemiology is different to SARS, which showed a classic epidemic curve and was over in eight months. The much longer persistence of MERS‐CoV in the population, with a lower reproductive number, some evidence of human‐to‐human transmission but an otherwise sporadic pattern, is difficult to explain. Using available epidemiological data, we implemented mathematical models to explore the transmission dynamics of MERS‐CoV in the context of mass gatherings such as the Hajj pilgrimage, and found a discrepancy between the observed and expected epidemiology. The fact that no epidemic occurred in returning Hajj pilgrims in either 2012 or 2013 contradicts the long persistence of the virus in human populations. The explanations for this discrepancy include an ongoing, repeated nonhuman/sporadic source, a large proportion of undetected or unreported human‐to‐human cases, or a combination of the two. Furthermore, MERS‐CoV is occurring in a region that is a major global transport hub and hosts significant mass gatherings, making it imperative to understand the source and means of the yet unexplained and puzzling ongoing persistence of the virus in the human population.     

Estimating the stability of census-based racial/ethnic classifications: the case of Brazil

This study presents a method of estimating the degree to which people change their racial/ethnic identity from one census enumeration to another. The technique is applied to the classification of skin colour in Brazil (white, black, brown, yellow). For the period 1950-80, the findings show a deficit of 38 per cent in the black category and a gain of 34 per cent in the brown category, suggesting that a large proportion of individuals who declared themselves black in 1950 reclassified themselves as brown in 1980. Estimates for 1980-90, adjusted for the effects of international migration, reveal a similar pattern, although the magnitude of colour reclassification may have declined somewhat during the 1980s. Procedures to determine the stability of racial/ethnic identity produce data useful to recent policy initiatives that rely on demographic censuses to measure changes in the status of minority groups in less developed countries.     

Ethnic variations in the relationship between income and fertility

The effects of husband'spotential andrelative incomes on completed fertility, as well as their effects on certain parity progression probabilities, are examined within samples of Anglos, Blacks and Mexican Americans. Relationships are estimated using data from the one-percent 1960 and 1970 U.S. Public Use Samples. The results reveal different patterns of relationship by ethnicity between the measures of income and the measures of fertility. The effects on completed fertility of the income measures are positive for Anglos and negative for Blacks, while in the case of Mexican Americans the effect ofpotential income is negative and that ofrelative income is positive. Income effects on the parity progression probabilities are similar in pattern to those from the analyses using completed fertility, although somewhat different patterns tend to appear at different birth orders, especially among Anglos.     

Is Personality Fixed? Personality Changes as Much as “Variable” Economic Factors and More Strongly Predicts Changes to Life Satisfaction

Personality is the strongest and most consistent cross-sectional predictor of high subjective well-being. Less predictive economic factors, such as higher income or improved job status, are often the focus of applied subjective well-being research due to a perception that they can change whereas personality cannot. As such there has been limited investigation into personality change and how such changes might bring about higher well-being. In a longitudinal analysis of 8625 individuals we examine Big Five personality measures at two time points to determine whether an individual’s personality changes and also the extent to which such changes in personality can predict changes in life satisfaction. We find that personality changes at least as much as economic factors and relates much more strongly to changes in life satisfaction. Our results therefore suggest that personality can change and that such change is important and meaningful. Our findings may help inform policy debate over how best to help individuals and nations improve their well-being.     

Variance Reduction Using Nonlinear Controls and Transformations

Nonlinear regression-adjusted control variables are investigated for improving variance reduction in statistical and system simulations. To this end, simple control variables are piecewise sectioned and then transformed using linear and nonlinear transformations. Optimal parameters of these transformations are selected using linear or nonlinear least-squares regression algorithms. As an example, piecewise power-transformed variables are used in the estimation of the mean for the twovariable Anderson-Darling goodness-of-fit statistic W ₂ ². Substantial variance reduction over straightforward controls is obtained. These parametric transformations are compared against optimal, additive nonparametric transformations obtained by using the ACE algorithm and are shown, in comparison to the results from ACE, to be nearly optimal.     

Similarity,Isomorphism or Duality? Recent Survey Evidence on the Human Resource Management Policies of Multinational Corporations

There is considerable debate as to the determinants of the human resource policies of human resource management: do they reflect national institutional or cultural realities, emerging common global practices, parent country effects or the dual effects of transnational and national realities? We use an extensive international database to explore these differences, assessing variations in a range of human resource practices. We find new evidence of national differences in the manner in which indigenous firms manage their people, but also evidence of a similarity in practice amongst multinational corporations. In other words, multinational corporations tend to manage their human resources in ways that are distinct from those of their host country; at the same time, country of origin effects seem relatively weak. Whilst there is some evidence of common global practices, sufficient diversity in practice persists to suggest that duality theories may provide the most appropriate explanation.     

Corporate Diversification,Information Asymmetry and Insider Trading

The literature suggests that corporate diversification destroys firm value. This value destruction is usually considered to be a consequence of managers' pursuing diversification strategies to benefit themselves rather than to increase firm value. This paper provides evidence that casts doubt on this agency theory‐based explanation for corporate diversification. Evidence based on insider trading suggests that managers themselves consider their diversification strategies to be value‐increasing. Specifically, it is documented that corporate insiders (directors) purchase more of their firms' shares in the open market when corporate diversification is high. Moreover, insiders purchase more when the level of diversification discount is high, suggesting that they disagree with outside investors' undervaluation due to diversification. It is also found that the market reaction to insiders' purchases is positively related to corporate diversification. This result suggests that outsiders consider the amount of favourable information contained in insiders' purchases to increase with the extent of corporate diversification.