Welfare policies and migration of the poor in the United States: An empirical note

This paper has investigated the impact of geographic welfare benefit differentials upon migration in the United States. Unlike other related studies, which typically focus upon black migration (as a surrogate measure of migration of the poor), the present study focuses directly upon migration of the poor per se. A variety of reduced-form estimates are provided. The evidence strongly suggests that the net in-migration of the poor is positively and significantly influenced by higher nominal AFDC levels and by higher real AFDC levels. These findings support the welfare magnet hypothesis, which alleges that relatively high welfare levels act to attract poor migrants. Moreover, given that poor migrants are attracted non only by high nominal welfare levels but also by high real welfare levels, an argument can be made for establishing geographically uniform real welfare benefit levels in the United States. This uniformity presumably should act, over the long run, to eliminate the human resource distortions being caused by the currently prevailing welfare system.The authors are indebted to Michael Greenwood, Dick Muth, Jim Kau and Janet Pack. Naturally, the usual caveat applies.     

False-negative probability in the SEM/EDS automated discovery of iGSR particles: A Bayesian approach

The automated search software integrated with a scanning electron microscope (SEM/EDS) has been the standard tool for detecting inorganic gunshot residues (iGSR) for several decades. The detection of these particles depends on various factors such as collection, preservation, contamination with organic matter, and the method for sample analysis. This article focuses on the influence of equipment resolution setup on the backscattered electron images of the sample. The pixel size of these images plays a crucial role in determining the detectability of iGSR particles, especially those with sizes close to the pixel size. In this study, we calculated the probability of missing all characteristic iGSR particles in a sample using an SEM/EDS automated search and how it depends on the image pixel resolution setup. We developed and validated an iGSR particle detection model that links particle size with equipment registers and applied it to 320 samples analyzed by a forensic science laboratory. Our results show that the probability of missing all characteristic iGSR particles due to their size is below 5% for pixel sizes below 0.32 μm². These findings indicate that pixel sizes as large as twice the one commonly used in laboratory casework, that is, 0.16 μm², are effective for initial sample scanning, yielding good detection rates of characteristic particles that could exponentially reduce laboratory workload.     

Collectivism or Isolation? Gender Relations in Urban La Paz,Bolivia

Latin American women's extensive collective action outside and inside the household has been paid much attention in the literature over the years. Only a handful of studies have challenged the arguments that Latin American women generally organise together and show solidarity with one another. This paper argues that women's collective action in contemporary urban Bolivia is relatively weak, both outside and within the household. The consequence is that women are isolated to a degree not hitherto recognised, an isolation women cope with in different ways.