Child Migration in the US and Spain: Towards a Global Border Regime?

In The New Politics of Immigration, Professor Catherine Dauvergne proposes that as migration policies converge at the global level, the traditional difference between settler societies and former European colonies is becoming irrelevant. To test this argument, this article addresses the impact of externalization, militarization, detention and deportation on unaccompanied migrant children along the southern Spanish and US borders. I conclude that the combined used of these strategies is designed to keep all unwanted migrants away from the physical border of the state, regardless of their background, and prevents children from accessing specific protections. Current border policy in these two countries shows the primacy of national security concerns over human rights and supports Dauvergne’s argument that distinctions between former colonies and settler societies are disappearing. The evidence considered here points towards an increasingly restrictive and punitive global border regime, but one with regional variations.     

Reward‐Modulated Response Inhibition,Cognitive Shifting,and the Orbital Frontal Cortex in Early Adolescence

Immaturities in cognitive shifting are associated with adolescent risk behaviors. The orbital frontal cortex (OFC) regulates reward processing and response inhibition. This study tested the relationship between cognitive shifting, OFC activity, and reward‐modulated response inhibition in young adolescents. An fMRI antisaccade (AS) paradigm examined the effects of reward conditions on inhibitory response and OFC processing. A validated self‐report inventory assessed cognitive shifting. Compared with neutral, reward trials showed better AS performance and increased OFC activation. Cognitive shifting positively associated with AS performance in reward and neutral trials. Poorer cognitive shifting predicted greater OFC activation. Results indicate lower OFC efficiency, as greater activation to achieve correct performance, underlies cognitive shifting problems. These neurocognitive impairments are relevant for understanding adolescent risk behaviors.     

A Matter of Learning: How Human Resources Affect Organizational Performance

Recently, a number of studies have tried to examine the processes that explain the influence of high performance work systems (HPWS) on company performance, in an attempt to understand which variables mediate this relationship and to what extent they do so. The importance of the organizational learning capability (OLC) construct has traditionally been outlined as being essential for a company's survival and effective performance. Thus, it seems important to establish whether HPWS can be considered an antecedent of OLC, and consequently to confirm whether OLC acts as a mediating variable in the HPWS–company performance linkage. Bearing in mind that HPWS represent a ‘bundle’ of mutually reinforcing, overlapping and synergistic individual human resource practices, this positive connection between HPWS and OLC seems reasonable. We tested our hypotheses by applying a structural equation methodology to a sample of 163 Spanish companies. Our findings show that the effects of HPWS on organizational performance are mediated by OLC.     

Quick counts from non-selected polling stations

Countless examples of misleading forecasts on behalf of both campaign and exit polls affecting, among others, British, French, and Spanish elections could be found. This has seriously damaged their image. Therefore, procedures should be used that minimize errors, especially on election night when errors are more noticeable, in order to maintain people's trust in surveys. This paper proposes a method to obtain quick and early outcome forecasts on the election night. The idea is to partly sample some (whatever) polling stations and use the consistency that polling stations show between elections to predict the final results. Model accuracy is analysed through simulation using seven different types of samples in four elections. The efficacy of the technique is also tested predicting the 2005 Eusko Legebiltzarra elections from real data. Results confirm that the procedure generates highly reliable and accurate forecasts. Furthermore, compared with the classical quick count strategy, the method is revealed as much more robust and precise.     

人在旅途 发在受伤

“五一”长假在即，大家又可以开开心心地外出旅游击了，开心之余，千万别忘记呵护秀发。 外出旅游，也许你只关心护肤的问题，因为你觉得保护肌肤非常重要．所以总忘不了带上洗面奶、润肤露、防晒霜之粪的护肤品．却很少有带洗护发用品的习惯和意识，或嫌麻烦．或寄希望于宾馆配备的简陋用品。然而，头发与皮肤一样需要你特别的护理。也许你还没认真想过，当你走出家门到各种陌生的旅游环境中，稍不注意，你的秀发就会受到各种各样的伤害。     

Out of Sight,Out of Mind: Distancing and the Geographic Relationship Between Electricity Consumption and Production in Massachusetts*

Objective. Based on the concept of “distancing” and its implications for ecological feedback and environmental inequality, this article examines the influence of geographic distance from power plants on residential electricity consumption in Massachusetts. Methods. Mean geographic distance to all power plants in Massachusetts was calculated to a rasterized surface and aggregated by municipality for 243 cities and towns. Using stepwise regression, annual per household residential electricity consumption by municipality was regressed on mean distance to power plants, median household income, percent minority, median number of rooms, and median age. Results. Mean geographic distance to power plants and median number of rooms emerged as statistically significant predictors of per household residential electricity consumption. Conclusions. The findings lend support to the concept of “distancing” and its implications for consumption in a domestic context. This analysis offers evidence of scale‐independent similarity between global and local phenomena of environmental inequality and resource consumption.     

The effect of verification bias on the comparison of predictive values of two binary diagnostic tests

The comparison of the accuracy of two binary diagnostic tests has traditionally required knowledge of the disease status in all of the patients in the sample via the application of a gold standard. In practice, the gold standard is not always applied to all patients in a sample, and the problem of partial verification of the disease arises. The accuracy of a binary diagnostic test can be measured in terms of positive and negative predictive values, which represent the accuracy of a diagnostic test when it is applied to a cohort of patients. In this paper, we deduce the maximum likelihood estimators of predictive values (PVs) of two binary diagnostic tests, and the hypothesis tests to compare these measures when, in the presence of partial disease verification, the verification process only depends on the results of the two diagnostic tests. The effect of verification bias on the naïve estimators of PVs of two diagnostic tests is studied, and simulation experiments are performed in order to investigate the small sample behaviour of hypothesis tests. The hypothesis tests which we have deduced can be applied when all of the patients are verified with the gold standard. The results obtained have been applied to the diagnosis of coronary stenosis.     

Obesity and excess mortality among the elderly in the United States and Mexico

Increasing levels of obesity could compromise future gains in life expectancy in low-and high-income countries. Although excess mortality associated with obesity and, more generally, higher levels of body mass index (BMI) have been investigated in the United States, there is little research about the impact of obesity on mortality in Latin American countries, where very the rapid rate of growth of prevalence of obesity and overweight occur jointly with poor socioeconomic conditions. The aim of this article is to assess the magnitude of excess mortality due to obesity and overweight in Mexico and the United States. For this purpose, we take advantage of two comparable data sets: the Health and Retirement Study 2000 and 2004 for the United States, and the Mexican Health and Aging Study 2001 and 2003 for Mexico. We find higher excess mortality risks among obese and overweight individuals aged 60 and older in Mexico than in the United States. Yet, when analyzing excess mortality among different socioeconomic strata, we observe greater gaps by education in the United States than in Mexico. We also find that although the probability of experiencing obesity-related chronic diseases among individuals with high BMI is larger for the U. S. elderly, the relative risk of dying conditional on experiencing these diseases is higher in Mexico.     

Comparison of the accuracy of multiple binary tests in the presence of partial disease verification

In the presence of partial disease verification, the comparison of the accuracy of binary diagnostic tests cannot be carried out through the paired comparison of the diagnostic tests applying McNemar's test, since for a subsample of patients the disease status is unknown. In this study, we have deduced the maximum likelihood estimators for the sensitivities and specificities of multiple binary diagnostic tests and we have studied various joint hypothesis tests based on the chi-square distribution to compare simultaneously the accuracy of these binary diagnostic tests when for some patients in the sample the disease status is unknown. Simulation experiments were carried out to study the type I error and the power of each hypothesis test deduced. The results obtained were applied to the diagnosis of coronary stenosis.