Experimentation order in factorial designs: new findings

Under some very reasonable hypotheses, it becomes evident that randomizing the run order of a factorial experiment does not always neutralize the effect of undesirable factors. Yet, these factors do have an influence on the response, depending on the order in which the experiments are conducted. On the other hand, changing the factor levels is many times costly; therefore it is not reasonable to leave to chance the number of changes necessary. For this reason, run orders that offer the minimum number of factor level changes and at the same time minimize the possible influence of undesirable factors on the experimentation have been sought. Sequences which are known to produce the desired properties in designs with 8 and 16 experiments can be found in the literature. In this paper, we provide the best possible sequences for designs with 32 experiments, as well as sequences that offer excellent properties for designs with 64 and 128 experiments. The method used to find them is based on a mixture of algorithmic searches and an augmentation of smaller designs.     

Predicting probabilities for the 2010 FIFA World Cup games using a Poisson-Gamma model

In this paper, we provide probabilistic predictions for soccer games of the 2010 FIFA World Cup modelling the number of goals scored in a game by each team. We use a Poisson distribution for the number of goals for each team in a game, where the scoring rate is considered unknown. We use a Gamma distribution for the scoring rate and the Gamma parameters are chosen using historical data and difference among teams defined by a strength factor for each team. The strength factor is a measure of discrimination among the national teams obtained from their memberships to fuzzy clusters. The clusters are obtained with the use of the Fuzzy C-means algorithm applied to a vector of variables, most of them available on the official FIFA website. Static and dynamic models were used to predict the World Cup outcomes and the performance of our predictions was evaluated using two comparison methods.     

Greenspace sites conserve taxonomic and functional diversity of dung beetles in an urbanized landscape in the Brazilian Cerrado

Urban Ecosystems - Urbanization transforms natural ecosystems, creating an environmental mosaic, characterized by native vegetation sites mixed with constructed sites. In this study, we compared...     

The Influence of Stakeholders on the Environmental Strategy of Service Firms: The Moderating Effects of Complexity,Uncertainty and Munificence*

Drawing on the resource‐based view of the firm, we examine how complexity, uncertainty and munificence in the general business environment moderate the association between a firm's stakeholder integration capability and its environmental strategy. Our data were drawn from 134 ski resorts in 12 countries in western Europe and North America. Our study finds that (1) an organizational capability of stakeholder integration is associated with a service firm's adoption of a proactive environmental strategy; (2) an uncertain business environment has a direct positive influence and a complex business environment has a direct negative influence on a firm's environmental strategy; and (3) complexity has a negative moderating influence on the relationship between a firm's stakeholder integration capability and its environmental strategy.     

Working for a Better Life: Longitudinal Evidence on the Predictors of Employment Among Recently Arrived Refugee Migrant Men Living in Australia

Although a number of studies have investigated the predictors of employment among refugee migrants, there is a dearth of evidence from longitudinal data. This study investigated the cross‐sectional and longitudinal predictors of employment among 233 adult refugee men living in South‐East Queensland, Australia. Participants were interviewed four times at six‐month intervals between 2008 and 2010. Using a conceptual model developed from the literature, Generalized Estimating Equations were used to model the predictors of employment. Over time, the employment rate increased from 44 per cent to 56 per cent. Region of birth, length of time in Australia, seeking employment through job service providers and informal networks, and owning a car were significant predictors of employment. Contrary to previous research, English language proficiency was not a significant predictor when other variables were controlled for. Recognition of overseas skills and qualifications decreased the chances of finding employment. The policy and programme implications are discussed.

Policy Implications

• Recognition of refugee migrants' overseas‐gained skills and qualifications does not guarantee them securing employment.
• Recognition of overseas skills and qualifications should be accompanied by educating employers, especially those outside the traditional migrant employment ‘niches’, about the resources and capabilities of refugee migrants, and the value of their qualifications.
• Fostering programmes that target the needs of job seekers from refugee backgrounds could enhance their employment outcomes.
• Supporting refugee migrants getting their drivers' licence and establishing favourable loan programmes that enable refugee migrants to buy a car can have a positive impact on their workforce participation.

     

Under Two Flags: Dual Nationality in Latin America and Its Consequences for Naturalization in the United States

This article surveys the practice of dual nationality in the Western Hemisphere, particularly as it impacts the naturalization rates of immigrants in the United States. The article begins by looking at the extent and spread of dual nationality provisions and the pathways for its implementation. Next, the article turns to a discussion of the multiple (and at times conflicting) interests – of immigrants, sending states and receiving states – in dual nationality. While immigrants and sending countries are in general agreement on the positive benefits of dual nationality, commentators in receiving countries like the United States continue to express deep unease at the spread of dual nationality and its consequences for American citizenship. Are these concerns justified? Not according to U.S. naturalization rates. Data from 1965 to 1997 indicate that immigrants from countries recognizing dual nationality average higher naturalization rates in the United States than countries that do not.