Total least squares solution for compositional data using linear models

The restrictive properties of compositional data, that is multivariate data with positive parts that carry only relative information in their components, call for special care to be taken while performing standard statistical methods, for example, regression analysis. Among the special methods suitable for handling this problem is the total least squares procedure (TLS, orthogonal regression, regression with errors in variables, calibration problem), performed after an appropriate log-ratio transformation. The difficulty or even impossibility of deeper statistical analysis (confidence regions, hypotheses testing) using the standard TLS techniques can be overcome by calibration solution based on linear regression. This approach can be combined with standard statistical inference, for example, confidence and prediction regions and bounds, hypotheses testing, etc., suitable for interpretation of results. Here, we deal with the simplest TLS problem where we assume a linear relationship between two errorless measurements of the same object (substance, quantity). We propose an iterative algorithm for estimating the calibration line and also give confidence ellipses for the location of unknown errorless results of measurement. Moreover, illustrative examples from the fields of geology, geochemistry and medicine are included. It is shown that the iterative algorithm converges to the same values as those obtained using the standard TLS techniques. Fitted lines and confidence regions are presented for both original and transformed compositional data. The paper contains basic principles of linear models and addresses many related problems.     

Sexual and Reproductive Strategies Among Serbian Gypsies

This paper deals with a full range of sexual and reproductive behaviors among different tribes of Gypsies in Serbia. The examined traits include rates of fertility, mortality, age distribution, education, crime rates, and parental care. In addition, Gypsy traditions of culturally prescribed sexual behavior are also studied. It is found that Gypsy tribes employ different reproductive strategies, ranging from an extreme, for humans, r (reproductive) strategy to a more typical K (parental) strategy. The reasons bringing about these differences come from the Gypsies' readiness to adjust their behavior and reproduction in order to create the most favorable strategy in a given environment. This paper elucidates and contrasts the more typical r-selected Gypsies with a group of K-selected Gypsies living in a Serbian village.     

Streamlining for democracy: Intercultural predispositions of the Croatian secondary school population

This work interprets the results of empirical research conducted into the intercultural predispositions of secondary school students in Croatia. Data were collected in 1993 and in 1998, using specially constructed questionnaires in which, for a variety of democratic values, a Likert-type battery of questions, were given to respondents. In 1993 the stratified research sample consisted only of secondary school students, while in 1998 the research sample also included students, parents and teachers. An analysis of the results shows that: (1) students had, generally speaking, affirmative attitudes both in 1993 and 1998 and that the hierarchy of support for these values remained the same; and (2) all three groups examined in 1998 shared a common hierarchy of values. However, they differed in the degree to which they accepted democratic values; teachers ranked the highest, students the lowest. The fact that students' attitudes were much closer to their parents' than to their teachers' leads to the conclusion that schools are not the major factor in the "political" socialization of young people in Croatia. This indicates a need for the introduction of new curriculum in all secondary schools. This curriculum should include educational content that emphasizes democratic values and intercultural relations, and methods that stress students' participation through action, reciprocity, dialogue, and solidarity, led by well-trained teachers.     

Environmental awareness and energy problems in Croatia

The article discusses the results of sociological research on environmental awareness in Croatia. A strong anti‐nuclear attitude is present, especially with respect to radioactive waste. Education is by far the strongest determining variable: those of high educational qualifications are critical in general as well as vis‐à‐vis specific issues, yet not necessarily critical in a negative sense.     

Resilience of Young People in Residential Care

Children and young people in residential care may have experienced or may experience various difficult, life-threatening events, such as neglect, abuse, or violence and maltreatment known as adversities. Despite this, some of them are able to function and even prosper and this has been attributed to the development of resilience. In this qualitative empirical study, we focus on the under-researched area of how young people in care reflect on and cope with such adversities. The exploratory research comprised of semi-structured interviews with young people in two different care settings – re-education centres and children’s homes. The results showed that the sample of 34 young people had experienced 73 adversities prior to leaving residential care and that half of them were not able to resolve some of these adversities. It was found that methods for dealing with adversity change during time spent in care and that a combination of various individual strategies, adaptation and accepting support are effective. The findings also indicate that the development of resilience may vary according to type of residential care setting specifically, whether these facilities allow the development of multiple individual strategies for dealing with adversities, or whether they provide social support. The article discusses implications for future research and practice in residential care.     

Social work with people with disabilities in Croatia: a qualitative study

In conducting this study, the authors aimed to gain insight into social work with people with disabilities. Due to the lack of research in this field, qualitative methodology was applied. Using semistructured interviews, data were collected about 30 respondents: 10 people with disabilities, 10 parents of people with disabilities, and 10 social workers who work in the public sector with people with disabilities. Analysis of the results revealed characteristics of approaches to social work, knowledge and skills used in working with people with disabilities, difficulties related to specific work with clients, and the position of the profession in society.     

Migration and Intergenerational Replacement in Europe

There are long‐standing concerns over low fertility levels in Europe and an increasingly important debate on the extent to which migration can compensate for below‐replacement fertility. To inform this debate, a wide array of indicators have been developed to assess the joint influence of fertility, mortality, and migration on birth replacement and intergenerational replacement. These indicators are based on various models and assumptions and some are particularly data demanding. In this article we propose a simple method to assess how far migration alters the extent of replacement for a birth cohort as it ages. We term the measure the overall replacement ratio (ORR). It is calculated by taking the size of a female birth cohort at selected ages divided by the average size of the cohorts of mothers in the year of birth. We present estimates of the ORR for a range of European countries representing different replacement regimes. We demonstrate that for many countries net migration has become a key factor in their population trends during the last few decades.