Compact matrix expressions for generalized Wald tests of equality of moment vectors

Asymptotic chi-squared test statistics for testing the equality ofmoment vectors are developed. The test statistics proposed aregeneralizedWald test statistics that specialize for different settings by inserting andappropriate asymptotic variance matrix of sample moments. Scaled teststatisticsare also considered for dealing with situations of non-iid sampling. Thespecializationwill be carried out for testing the equality of multinomial populations, andtheequality of variance and correlation matrices for both normal andnon-normaldata. When testing the equality of correlation matrices, a scaled versionofthe normal theory chi-squared statistic is proven to be an asymptoticallyexactchi-squared statistic in the case of elliptical data.

Rain and the democratic window of opportunity

According to the economic approach to politicaltransitions, transitory negative economic shocks can open a windowof opportunity for democratic improvement. Testing the theoryrequires a source of transitory shocks to the aggregate economy. Weuse rainfall shocks in Sub-Saharan African countries and find thatnegative rainfall shocks are followed by significant improvement indemocratic institutions. Instrumental variables estimates indicate thatfollowing a transitory negative income shock of 1 percent,democracy scores improve by 0.9 percentage points and theprobability of a democratic transition increases by 1.3 percentagepoints.

Growing The Fields of Opportunity for Children and Adults with Autism in Iowa, 2009-2010

Many would argue that the dramatic rise in autism has reached critical mass, and this council echoes that statement. Iowa, like many states in the nation, is currently ill equipped to handle the large influx of children and adults with autism. When this council was initially formed we were facing diagnosis rates of 1 in 150 and currently the diagnosis rate is 1 in 91. Current resource strains in education, qualified trained professionals, access to care, and financial services are rapidly deteriorating Iowa’s ability to deliver quality services to children, adults, and families affected by autism. If Iowa leadership fails to act quickly the already strained system will face a breaking point in the following areas: financing, coordination of care, educational resources, early identification, adult services, and access to service delivery - just to name a few. This council has taken the past 12 plus months hearing testimony from state officials, providers, and caregivers to ensure that care for those with autism is effective, cost efficient, and accessible. This council will be making recommendations on three major areas; early identification, seamless support/coordination of care, and financing of care. While these areas will be highlighted in this first annual report it in no way minimizes other areas that need to be addressed such as early intervention, special education, training, in-home support services, financing options, and data collection. Implementing the initial recommendations of this council will lay foundational support for the areas mentioned above. Often those in position to help ask what can be done to help families in Iowa. This council has provided a roadmap to help facilitate effective and proven treatments to children and adults with autism.

Inequality of opportunity in educational achievement in Latin America: evidence from PISA 2006-2009

We assess inequality of opportunity in educational achievement in six Latin American countries, employing two waves of PISA data (2006 and 2009). By means of a non-parametric approach using a decomposable inequality index, GE(0), we rank countries according to their degree of inequality of opportunity. We work with alternative characterizations of types: school type (public or private), gender, parental education, and combinations of those variables. We calculate incremental contributions of each set of circumstances to inequality. We provide rankings of countries based on unconditional inequalities (using conventional indices) and on conditional inequalities (EOp indices), and the two sets of rankings do not always coincide. Inequality of opportunities range from less than 1% to up to 27%, with substantial heterogeneity according to the year, the country, the subject and the specificication of circumstances. Robustness checks based on bootstrap and the use of an alternative index confirm most of the initial results.

The equity aspect within the framework of the assessment of the quality of Higher Education : developing indicators to identify students with a higher risk of failure at university with a view to improving equality of chances of succes

Resumen basado en el de la publicaci??n

Operatives’ experiences of cultural diversity on Australian construction sites

Construction sites are among Australia's most culturally diverse workplaces. A survey of 1155 construction operatives on Australian construction sites investigated, for the first time, the extent of this diversity and how it is experienced by workers. Results show that while cultural diversity presents organizational challenges by segregating the workforce, operatives' cultural groups also perform positive functions such as maintaining positive bonds among group members and providing group support and safe havens. While there broadly appears to be equality of opportunity for all cultural groups, there is significant evidence of differential treatment for some groups, particularly in relation to accessing higher paying jobs, offensive graffiti and racist joke telling. Language barriers are one of the major challenges affecting work and social relations between different cultural groups and there is evidence that this has a detrimental impact upon safety.

Humid periods in southern Arabia: windows of opportunity for modern human dispersal.

Arabia is a key area for the dispersal of anatomically modern humans (AMH, Homo sapiens) out of Africa. Given its modern hostile environment, the question of the timing of dispersal is also a question of climatic conditions. Fresh water and food were crucial factors facilitating AMH expansions into Arabia. By dating relict lake deposits, four periods of lake formation were identified: one during the early Holocene and three during the late Pleistocene centered ca. 80, ca. 100, and ca. 125 ka. Favorable environmental conditions during these periods allowed AMH to migrate across southern Arabia. Between ca. 75 and 10.5 ka, arid conditions prevailed and turned southern Arabia into a natural barrier for human dispersal. Thus, expansion of AMH through the southern corridor into Asia must have taken place before 75 ka, possibly in multiple dispersals.

Modifications and Alternatives to the Tests of Levene and Brown & Forsythe for Equality of Variances and Means

The usual tests to compare variances and means (e. g. Bartlett`s test and F-test) assume that the sample comes from a normal distribution. In addition, the test for equality of means requires the assumption of homogeneity of variances. In some situation those assumptions are not satisfied, hence we may face problems like excessive size and low power. In this paper, we describe two tests, namely the Levene`s test for equality of variances, which is robust under nonnormality; and the Brown and Forsythe`s test for equality of means. We also present some modifications of the Levene`s test and Brown and Forsythe`s test, proposed by different authors. We analyzed and applied one modified form of Brown and Forsythe`s test to a real data set. This test is a robust alternative under nonnormality, heteroscedasticity and also when the data set has influential observations. The equality of variance can be well tested by Levene`s test with centering at the sample median.

Inequality of opportunity in daycare and preschool services in Brazil

In this paper we measure inequality of opportunity in daycare and preschool services in Brazil. For this purpose, we construct an opportunity index that modifies the human opportunity index proposed in the literature and used in Barros et al. (2009) to measure inequality in basic opportunities in Latin America and the Caribbean. Specifically, we construct an opportunity measure that includes not only attendance but also parental choice not to enroll children in daycare or preschool, using data from a supplementary questionnaire included in the 2006 version of Pesquisa Nacional por Amostra de Domicílios (PNAD). The results show that there are large differences between our opportunity index and the human opportunity index for children aged 0-3 years old and considerably smaller differences for children aged 4-6 years old, which suggests that preschool may be closer to a basic opportunity than daycare.

SMEs in the environmental goods and services market: identifying areas of opportunity, policies and instruments: case studies: Argentina, Chile, Colombia and Mexico

Includes bibliography

Proposal on indicators for follow-up to the goals of the International Conference on Population and Development in Latin America and the Caribbean

Includes bibliography

Relations between CARICOM and Central America and the Dominican Republic: a window of opportunity for trade and investment

Includes bibliography

Digital inclusion in education in Tarija, Plurinational State of Bolivia

This study analyses digital inclusion in secondary education in the Tarija School District in the Plurinational State of Bolivia for the 2012-2013 school year, using the indicators in the Plan of Action for the Information Society in Latin America and the Caribbean (Plan of Action elac). This is an exploratory and descriptive analysis based on a sample of 311 students, 108 teachers and 15 school principals. According to the findings, teenagers use the Internet to look for information and entertainment; the expansion of mobile technology among them offers numerous educational opportunities; and insufficient training for teachers on how to integrate information and communications technologies (icts) into the learning process is a top challenge. The existence of icts in schools has been confirmed, but not their use. Local and national efforts are helping to reduce the digital divide and promote equality of opportunity for young people.