Local principal differential analysis: Graphical methods for functional data with covariates

We focus on principal differential analysis (PDA) of functional data for obtaining a low-dimensional representation of a collection of curves. PDA assumes there exists a linear differential operator that results in the zero-function when it is applied to each of the data curves, or equivalently, that the curves belong to a low-dimensional subspace of a normed linear space. PDA sets out to estimate this linear differential operator from the data and proceeds from there. Our contribution is to explain how subject covariates can be incorporated into a PDA analysis for graphical exploration of patterns in the data.     

Excessive Gambling and Online Gambling Communities

The Internet provides an accessible context for online gambling and gambling-related online communities, such as discussion forums for gamblers. These communities may be particularly attractive to young gamblers who are active Internet users. The aim of this study was to examine the use of gambling-related online communities and their relevance to excessive gambling among 15–25-year-old Finnish Internet users (N?=?1200). Excessive gambling was assessed by using the South Oaks Gambling Screen. Respondents were asked in a survey about their use of various kinds of gambling-related online communities, and sociodemographic and behavioral factors were adjusted. The results of the study revealed that over half (54.33%) of respondents who had visited gambling-related online communities were either at-risk gamblers or probable pathological gamblers. Discussion in these communities was mainly based on sharing gambling tips and experiences, and very few respondents said that they related to gambling problems and recovery. In three different regression models, visiting gambling-related online communities was a significant predictor for excessive gambling (with 95% confidence level) even after adjusting confounding factors. The association of visiting such sites was even stronger among probable pathological gamblers than among at-risk gamblers. Health professionals working with young people should be aware of the role of online communities in terms of development and persistence of excessive gambling. Monitoring the use of online gambling communities as well as utilizing recovery-oriented support both offline and online would be important in preventing further problems. Gambling platforms should also include warnings about excessive gambling and provide links to helpful sources.     

Moving beyond the employee: The role of the organizational context in leader workplace aggression

Management and psychology scholars are increasingly seeking to examine how organizational characteristics that contextualize leadership shape the occurrence, impact, and prevention of leader workplace aggression. However, a comprehensive review of this literature has not yet been conducted, so a systematic understanding is lacking regarding questions including: (1) when, why and how is such aggression more likely to occur; (2) how do contextual factors enable or constrain effects of these leader behaviors on employees; and (3) how can organizations proactively manage their internal dynamics to prevent or reduce such incidences? Drawing on Porter and McLaughlin's (2006) components of organizational context, I review existing leader aggression research that intersects with seven categories: (1) culture/climate; (2) goals/purposes; (3) people/composition; (4) processes; (5) state/condition; (6) structure; and (7) time. I then offer theoretical propositions for future work, which are grounded in the roles and responsibilities inherent to the nature of leadership and coupled with the changing nature of organizational life. As a result, I set the research agenda for the next decade of organizational context × leader workplace aggression studies.     

‘For the sake of the family and future’: the linked lives of highly skilled Indian migrants

ABSTRACT

While in Western literature, migration is generally considered an individual or (nuclear) household phenomenon, Indian context adds the strong presence of parents and extended family to the constellation. This paper addresses how significant others shape the life course events and the migration trajectories of highly skilled Indian migrants to the Netherlands and UK. We employ a qualitative approach to the life course framework to highlight the linked lives that can alter the migration decisions. Our findings are drawn from 47 semi-structured biographic interviews. The results underscore how further migration decisions are often informed by the implications of the different life stages of the linked lives, the key elements being care-giving by and for the parents. Furthermore, we also illustrate how migration provides space for negotiating social norms and expectations: due to the geographical distance between migrants and their parents, the local (non-Indian) context plays a bigger role and thus the need for and timing of conformity with norms can be postponed. The understanding of family life in transnational settings will be enriched when individuals are embedded within the cultural background and linked lives are extended beyond the immediate nuclear family.     

Groom price-female human capital: Some empirical evidence

This paper examines the effect of female human capital endowment on the groom price or dowry by using a newly available data set that was created by surveying the middle-class residents of Patna, Bihar. The estimates based on the OLS and 2SLS suggest the existence of positive association between the two variables for the sample under study. The result can be viewed as a positive; albeit, a small step towards settling the issue as to whether or not dowry is an obstacle to female human capital formation.     

The Value Relevance of Fair Value

This paper investigates the value relevance of revalued tangible assets and its variation depending on industry, size of the firm and age of revalued amounts. It examines the reaction of investors on the Romanian market, a developing market, in the period of economic growth between 2003 and 2007, before Romania’s adherence to the European Union. Also, it suggests a model which allows for the comparative analysis of the influence over share price attributed to two equity growth sources: revaluation reserves and operational profit. The findings confirm the central hypothesis of the study—revaluated amounts of tangible assets are value relevant—and verify the predictive and feedback value, timeliness, reliability, and the possibilities for fair value implementation, characteristics which have been selected for testing. However, the results are less consistent than the outcome of the variable which reflects the equity growth due to profit, which leads to a moderate value relevance of fair value in the case of revaluated tangible assets. The value relevance analysis on clusters verifies the established hypotheses regarding the superiority of value relevance for the manufacturing sector as opposed to the service sector and of revaluations older than 2 years compared to more recent revaluations. The hypothesis regarding higher value relevance of revaluated amounts disclosed by large firms compared to SMEs is not confirmed, as only the latter presented significant statistical values.     

Ergonomic intervention in aonla pricking operation during preserve preparation in food processing industries

Aonla is an important Indian fruit crop with great potential for processing into various quality products. Aonla preserve making is an important economic activity in our country. The pricking methods are age old, hence a hand operated aonla pricking machine was introduced in preserve making industries to speed up the pricking task. OWAS and RULA two of the most commonly used ergonomic assessment tools were evaluated for their efficacy in the assessment pricking along with Rating of perceived exertion scale. Analysis of working posture using RULA revealed that the pricking task with existing methods i.e. fork and hand tool requires immediate investigation and changes in working posture while with machine pricking investigations and changes are required soon. The results of OWAS indicated that the posture maintained while pricking with existing methods need to be changed in future planning while with machine was acceptable. The subjective assessment revealed that machine pricking was less exerting activity as compared to the existing methods. The preserve prepared from machine pricked fruit was most acceptable among consumers. Hence, in the form of machine ergonomic intervention was brought about in preservation industries which have proved beneficial for workers in terms of their safety and productivity.     

Beyond social networking: Performing global Englishes in Facebook by college youth in Nepal1

Until recently, scholarship on online social networking has mostly focused on issues of social relationship, privacy, identity and literacy. Research on the interface between multilingualism, multimodality and online social networking from a discursive perspective is relatively limited. This ethno‐graphic study draws data from Facebook pages composed and hosted over two years by three economically and educationally privileged undergraduate students in Nepal and uses conceptual constructs of mediascape, convergence culture and global Englishes. The study investigates how the advent of social networking online in Facebook by college youth has influenced their use of the English language and other semiotic resources to index both their local and cosmopolitan identities. Findings suggest that these youth are using social networking to redefine the role of English in relation to their existing social relationships, innovatively mixing English and Nepali in order to construct their bilingual identities, and embedding English with other texts to recontextualize both local and global media content. The paper concludes with a summary of major findings which suggest that online social networking practices have significantly helped to bring about a cultural change among this particular social group in Nepal.      

Environmental and crown related factors affecting street tree transpiration in Helsinki,Finland

We investigated the drivers of street tree transpiration in boreal conditions, in order to better understand tree water use in the context of urban tree planning and stormwater management. Two streets built in Helsinki in 2002, hemiboreal zone that had been planted either with Tilia?×?vulgaris or Alnus glutinosa f. pyramidalis were used as the study sites. Tree water use was measured from sap flow over the 2008–2011 period by the heat dissipation method. Penman-Monteith based evapotranspiration models of increasing complexity were tested against the tree water use measurements to assess the role of environmental and tree related factors in tree transpiration. Alnus and Tilia respectively used 1.1 and 0.8 l of water per m² of leaf area per day under ample water conditions, but the annual variation was high. The Penman-Monteith evapotranspiration estimate and soil water status changes explained over 80 % of the variation in tree transpiration when the model was parameterized annually. The addition of tree crown surface area in the model improved its accuracy and diminished variation between years and sites. Using single parameterization over all four years instead of annually varying one did not produce reliable estimates of tree transpiration. Tree transpiration, scaled to different canopy cover percentages, implied that the columnar Alnus trees could transpire as much as all annual rainfall at or less than 50 % canopy cover.     

A mathematical model of a population genetics: Effects of genetic variation on homosexuality

This study deals with simple mathematical models for the purpose of generating testable prediction in genetics. The genetic effects in human population are because of the following four factors, (i) paternal, (ii) maternal, (iii) environmental and (iv) idiopathic. For the measurement of genetic characteristics, the environment also plays an important role. In the present paper we analyze this linkage for homosexuality for the first three factors because the fourth one affects a very little population. This study provides genetics and evolutionary basis for making generating testable predictions specifically where the environmental factors affect the characteristics of genes which also influence homosexuality. The effect of environment on homosexuality is highlighted because earlier studies confined only up to the paternal and maternal linkages. We consider two types of selections (i) direct selection with environmental effects (ii) combined selection with direct, maternal and environmental effects. The objective of this investigation is to provide the conditions for the maintenance of genetic variation of genotype of male and female. We concentrate on highlighting homosexuality as a result of variation in genes. Numerical results are obtained by taking illustration. The sensitivity analysis is carried out to explore homosexuality in terms of fitness loss and fitness gain.