Statistics in Latin America

Statistics is a relatively new discipline in Latin America. At present only sparse information is available about the state of the statistical profession in Latin America. We present and summarize the available information about the job market; training, education, and research; professional societies and their activities; and so forth. We also share our hopes, concerns, and suggestions for the future.     

Testing for abrupt breaks in variance structures with smooth changes

Abstract

We investigate the problem of testing for variance breaks in the case where the variance structure is assumed to be smoothly time-varying under the null. Since the classical tests are aimed to detect any change in the variance, they are not able to distinguish between smooth non constant variance and abrupt breaks. In this paper a new procedure for detecting variance breaks taking into account for smooth changes in the variance under the null is proposed. The finite sample properties of the test we introduce are investigated by Monte Carlo experiments. The theoretical outputs are illustrated using U.S. macroeconomic data.     

The sample monomode and an associated test for discrete monomodality

Abstract

The notions of (sample) mean, median and mode are common tools for describing the central tendency of a given probability distribution. In this article, we propose a new measure of central tendency, the sample monomode, which is related to the notion of sample mode. We also illustrate the computation of the sample monomode and propose a statistical test for discrete monomodality based on the likelihood ratio statistic.     

Followers and leaders: Reciprocity,social norms and group behavior

This paper proposes a model of norm-driven preferences and studies the determinants of norm compliance in games. It predicts that (i) compliance follows a law of demand and (ii) people respect norms in a reciprocal manner: they are more likely to comply if others are expected to comply too. Reciprocal norm compliance might explain why successful revolutions or strikes grow in a snow-balled fashion, leaders motivate others to join social movements, or sequential mechanisms (instead of simultaneous ones) are usually employed in charity fundraising.     

Retirement migration and transnationalism in northern Mexico

This article examines the phenomenon of transnationalism among retired immigrants living in border areas of northern Mexico. Using in-depth interviews conducted with US retirees residing in Baja California, Mexico, we seek to examine how transnational aging is constructed through different practices, relationships, networks and exchanges between both cultures and countries. We analyse several analytical dimensions of transnationalism including social, economic, cultural, identity and belonging conditions. In particular, networks and exchanges among these elderly migrants are most frequently constructed across social and family networks, economic transfers, access to healthcare, and culture. Additionally, we find that these maintained transnational practices in northern Mexico parallel those of international retired migrants living in other parts of the world. However, we argue that the proximity to the US border enables and encourages many types of connections of varying intensities. Finally, we discuss the implications for future research linking transnationalism with international retirement migration.     

DDP—Managerial opportunities and consequences

Applications of DDP are examined via two case studies to determine how the technology was used by management to aid decision-making; the level of management involvement in the MIS (Management Information Systems) design process and the nature of the relationship between managers and data processing departments were also considered. The study showed that because the technology was largely under end user control, better tailored information systems resulted and system output was more directly used by middle and top managers. This only occurred, however, if certain moderators, such as computing and modelling skills, were present in functional departments. DDP also offers opportunities for better relationships with data processing departments but the consequences include the need for better management training and functional support groups for systems implementation. A conceptual model is presented as a theoretical framework to guide organisations when using DDP.     

Impact of Gender and the Stereotyped Nature of Illustrations on Choice of Color: Replica of the Study by Karniol (2011) in a Spanish Sample

Early acquisition of stereotypes that associate “blue” with boys and “pink” with girls can influence their preferences for these colors and also their choices in clothing, toys or objects in relation to gender stereotypes. In a Spanish sample (5–10-year olds, n = 614), this study reproduces the previous research conducted by Karniol (Sex Roles 65(1/2):119–132, 2011) for the purpose of analyzing whether gender-linked color preferences rule the choice of coloring booklets and if children’s choices of color are affected by their own gender. The results show that although boys used fewer female-stereotyped colors than girls, both genders colored in each figure with the stereotyped colors associated with them. This result indicates that boys and girls share similar gender stereotypes and use colors that agree with these stereotypes.     

Quasi stable outcomes in the assignment game

There is a great deal of literature on matching, theoretical, and empirical, concerning stable assignments and mechanisms that achieve them. The starting point of this study is an interesting question about assignment procedures: given a situation where some agents (the senior workers) on one side have a priority status, which changes the classical theory. The core of game may not be stable. We prove the existence of a quasi stable constrained core. This constrained core may not be a lattice but it is a finite and disjoint union of complete lattices that check the properties of the core’s classical assignment game. We study the manipulability questions that derive.     

Test of Homogeneity for Some Population Models Based on Counting Processes

This work deals with hypothesis testing for some population models based on counting processes. An asymptotic hypothesis testing to find out certain homogeneity conditions about the parameters of these models is carried out. Some local alternatives are considered and these results are applied to prove homogeneity of the resistance level of susceptible individuals in a population which is subdivided into sub populations and is being attacked by an infectious disease.