Modeling wind energy flux by a Birnbaum–Saunders distribution with an unknown shift parameter

In this paper, we discuss a Birnbaum–Saunders distribution with an unknown shift parameter and apply it to wind energy modeling. We describe structural aspects of this distribution including properties, moments, mode and hazard and shape analyses. We also discuss estimation, goodness of fit and diagnostic methods for this distribution. A computational implementation in R language of the obtained results is provided. Finally, we apply such results to two unpublished real wind speed data from Chile, which allows us to show the characteristics of this statistical distribution and to model wind energy flux.     

Non‐parametric Copula Estimation Under Bivariate Censoring

In this paper, we consider non‐parametric copula inference under bivariate censoring. Based on an estimator of the joint cumulative distribution function, we define a discrete and two smooth estimators of the copula. The construction that we propose is valid for a large range of estimators of the distribution function and therefore for a large range of bivariate censoring frameworks. Under some conditions on the tails of the distributions, the weak convergence of the corresponding copula processes is obtained in l^∞([0,1]²). We derive the uniform convergence rates of the copula density estimators deduced from our smooth copula estimators. Investigation of the practical behaviour of these estimators is performed through a simulation study and two real data applications, corresponding to different censoring settings. We use our non‐parametric estimators to define a goodness‐of‐fit procedure for parametric copula models. A new bootstrap scheme is proposed to compute the critical values.     

Voluntary childlessness in a society reluctant to change

Voluntary childlessness constitutes a social and generational rupture from tradition and culture, with significant effects on the reproduction of the so-called life and family cycle. This study aims at understanding the reasons why people decide to remain childless and the social pressures that this decision generates. A qualitative phenomenological study was conducted on the emerging decision of non-motherhood and non-fatherhood based on semi-structured interviews with 56 people who autonomously made the decision to opt out of parenthood. This paper underscores the multiple biographical situations involved in the decision, in addition to the concerns about personal development and future. The current social crisis context serves as a means of justification to lessen social and family pressure. We conclude that people who have made this decision promote a different meaning from that of reproduction as a mechanism of the social order.     

Being Under Pressure to Sext: Adolescents' Experiences,Reactions, and Counter-Strategies

This study explored adolescents' experiences of being under pressure to sext (sending nude images), offering insights into what situations adolescents view as pressuring, how adolescents react to the pressure, and what counter-strategies they use. Written statements from 225 adolescents (age 13–16 years, M = 14.4 years, SD = 0.93) were analyzed using thematic analysis. Results indicated a range of situations including both explicit and implicit pressure. The pressure elicited different emotional responses, including severe physical and psychological reactions, becoming distressed, and being seemingly unconcerned. A majority of the adolescents reported successful strategies on how to ward off the unwanted sexual requests. This study provides insight into how young people cope with potentially harmful situations online.     

RENT CREATION AND RENT SHARING: NEW MEASURES AND IMPACTS ON TOTAL FACTOR PRODUCTIVITY

This analysis proposes new measures of rent creation and rent sharing and assesses their impact on productivity on cross‐country‐industry panel data. We find first that: (1) anticompetitive product market regulations positively affect rent creation and (2) employment protection legislation boosts hourly wages, particularly for low‐skill workers. However, we find no significant impact of this employment legislation on rent sharing, as the hourly wage increases are offset by a negative impact on hours worked. Second, using regulation indicators as instruments, we find that rent creation and rent sharing both have a substantial negative impact on total factor productivity. (JEL E22, E24, O30, L50, O43, O47, C23)     

The raise estimator estimation,inference, and properties

Several methods using different approaches have been developed to remedy the consequences of collinearity. To the best of our knowledge, only the raise estimator proposed by García et al. (2010 García, C.B., García, J., Soto, J. (2010). The raise method: An alternative procedure to estimate the parameters in presence of collinearity. Qual. Quantity 45(2):403–423.[Crossref], [Web of Science ®] , [Google Scholar]) deals with this problem from a geometric perspective. This article fully develops the raise estimator for a model with two standardized explanatory variables. Inference in the raise estimator is examined, showing that it can be obtained from ordinary least squares methodology. In addition, contrary to what happens in ridge regression, the raise estimator maintains the coefficient of determination value constant. The expression of the variance inflation factor for the raise estimator is also presented. Finally, a comparative study of the raise and ridge estimators is carried out using an example.     

Computing the <Emphasis Type="Italic">k</Emphasis>-resilience of a synchronized multi-robot system

The vertex arboricity va(G) of a graph G is the minimum number of colors the vertices can be colored so that each color class induces a forest. It was known that \(va(G)\le 3\) for every planar graph G. In this paper, we prove that \(va(G)\le 2\) if G is a planar graph without intersecting 5-cycles.     

Variations in horizontal and vertical individualism-collectivism in four regions of Mexico / Variaciones en el individualismo-colectivismo horizontal y vertical en cuatro regiones de México

Cultures can be analysed through cultural syndromes (shared patterns of beliefs, attitudes, norms, roles and values organized around a theme). One of these syndromes, individualism-collectivism, distinguishes collectivist cultures, which prioritize collective over individual interests, from individualist cultures, which value individual autonomy, achievement and freedom. These dimensions intersect with the horizontal-vertical syndrome, where verticality means the preference for a society organized by hierarchies, in contrast to a horizontal culture, which privileges equality. This paper explores these dimensions using a new instrument in a sample of 990 participants from four regions in Mexico. The results of exploratory and confirmatory factorial analyses show four theoretically congruent factors with adequate levels of internal consistency reaching metric equivalence criteria in three of the four samples. The scores show greater support for horizontal individualism and less support for vertical collectivism. These results are discussed within the context of a cultural shift towards individualism.     

New sign language new(S): the globalization of sign language in the smartphone era

Languages are dynamic and change over the years. Changes in sign languages have been usually initiated to accommodate the needs of the local Deaf community. With the increase in smartphone use, sign languages are influenced not only by the local Deaf community, but also by foreign Deaf people on the other side of the screen, regardless of their location. Smartphones influence the sign language itself and the Deaf community by connecting different communities of Deaf people through messages, shared information and experiences, and news delivery. The popularity of this technology among Deaf communities is a social phenomenon emerging from Deaf people themselves. Smartphones may promote the globalization of sign language, shortening distances between Deaf communities around the world.     

Interior Immigration Enforcement and Political Participation of U.S. Citizens in Mixed-Status Households

The 2000s have witnessed an expansion of interior immigration enforcement in the United States. At the same time, the country has experienced a major demographic transformation, with the number of U.S. citizens living in mixed-status households—that is, households where at least one family member is an unauthorized migrant—reaching 16 million. U.S. citizens living in mixed-status households are personally connected to the struggles experienced by their unauthorized family members. For them, immigration policy is likely to shape their current and future voting behavior. Using data from the 2002–2014 Current Population Survey Voting and Registration Supplements, we examine whether intensified immigration enforcement has affected the political engagement of U.S. citizens living in mixed-status households. We find that immigration enforcement has chilled their electoral participation by lowering their propensity to register by 5 %; however, it has not visibly affected their voting propensity among those registered. Importantly, their lower voting registration likelihood does not seem to reflect indifference for community and public matters, given that it has been accompanied by greater involvement in civic forms of political participation, such as volunteering. Understanding how immigration policy affects the political participation of a fast-growing segment of the electorate is imperative because they will inevitably constitute a rapidly rising political force in future elections.