A bilevel programming problem with maximization of a supermodular function in the lower level

In bilevel programming there are two decision makers, the leader and the follower, who act in a hierarchy. In this paper we deal with a bilevel problem where the follower maximizes a supermodular function. The payoff for the leader is given by the weighted set that is chosen by the follower. To increase his payoff the leader can increase the supermodular function of the follower by a modular one, thus influencing the follower’s decision, but he has to pay a penalty for this. We want to find an optimum strategy for the leader. This is a bilevel programming problem with continuous variables in the upper level and a parametric supermodular maximization problem in the lower level. We analyze the structure of the bilevel problem. This we use to provide an equivalent one-level combinatorial problem. Finally, we investigate the properties of the new problem.     

Zero-Inflated NGINAR(1) process

In this paper, we develop a zero-inflated NGINAR(1) process as an alternative to the NGINAR(1) process (Risti?, Nasti?, and Bakouch 2009 Risti?, M. M., A. S. Nasti?, and H. S. Bakouch. 2009. A new geometric first-order integer-valued autoregressive (NGINAR(1)) process. Journal of Statistical Planning and Inference 139:2218–26.[Crossref], [Web of Science ®] , [Google Scholar]) when the number of zeros in the data is larger than the expected number of zeros by the geometric process. The proposed process has zero-inflated geometric marginals and contains the NGINAR(1) process as a particular case. In addition, various properties of the new process are derived such as conditional distribution and autocorrelation structure. Yule-Walker, probability based Yule-Walker, conditional least squares and conditional maximum likelihood estimators of the model parameters are derived. An extensive Monte Carlo experiment is conducted to evaluate the performances of these estimators in finite samples. Forecasting performances of the model are discussed. Application to a real data set shows the flexibility and potentiality of the new model.     

Using creative methods to research across difference. An introduction to the special issue

ABSTRACT

This special issue explores some of the methodological challenges that are brought into play when scholars deploy creative methods to research across difference. This introductory article defines what we mean by ‘creative methods’ and discusses some of the strengths and weaknesses of using this approach within social science research. It then outlines how creative methods can be used to research across difference, specifically, and introduces the seven articles that make up the special issue.     

Associations between Croatian Adolescents’ Use of Sexually Explicit Material and Risky Sexual Behavior: A Latent Growth Curve Modeling Approach

Objectives: The aim of this biobehavioral longitudinal study was to assess the association between sexually explicit material (SEM) use and risky sexual behavior among Croatian adolescents (n?=?577). Methods: The data were collected over the period of 15?months. Conditional dual-domain latent growth modeling was used. Results: Male adolescents’ initial SEM use, but not subsequent growth, was related to changes in sexual risk taking over the observed period. Among female adolescents, SEM use and sexual risk taking were significantly related only at baseline. Conclusions: Our findings point to gender-specific association between adolescents’ SEM use and risky sexual behavior.     

Predictors of Generative Action Among Adults in Two Transitional Countries

One of the widest elaborations of generativity today is the theoretical model proposed by McAdams and de St. Aubin. This model has not yet been tested completely, that is only some of its components and their relations have been tested. The main reasons for such an empirical status of the model are inadequately clear operationalizations of the components of the model. After our previous research, which include adaptation of scales for measuring of some key components of model, generative care and generative action (Lacković-Grgin et al., Suvremena Psihologija, 5, 9, 2002; Lacković-Grgin, Zbirka psihologijskih skala i upitnika, Zadar: University of Zadar, 2004; Tucak et al., Generativna briga i generativno djelovanje u odraslih osoba u Hrvatskoj i Sloveniji, XVII Dani Ramira i Zorana Bujasa, Summaries, 98, 2005), as well as operationalization of so called belief in species component (which is a component of Philosophy about human nature) (Ćubela Adorić et al., Philosophies of Human Nature in Adolescents and Adults, 7th Alps-Adria Conference in Psychology, Abstracts, 167, 2005), in this paper we have tried to evaluate life goals questionnaire. This questionnaire tried to measure the other component of the model—inner desire. In that way we could realize the main goal of this paper, research of how important are the evaluations in the prediction of generative action in Croatian and Slovenian adults. Generative action is under the strong influence of cultural demands and inner desires. There are more sociological and economical indications about the differences in expected social development in countries like Croatia and Slovenia. Because of the fact that in the last decade Slovenia has been developed more than Croatia, we could expect that this could also be manifested in assessment of importance of some areas of life, which are relevant for generative action (e.g., work, marriage, free time), for life goals of agency and communion, as well as for generative care as a possible predictor of generative action. The greater differences were obtained in some predictors of generative action (e.g. importance of job, importance of free time, goals of agency and communion), as well as in their predictive importance.     

Blurring reality with fiction: Exploring the stories of women,madness, and infanticide

Problem

Often, there is a sense of shock and disbelief when a mother murders her child.

The Image of Ottomans in Croatian Historiography: Changing Narratives in Elementary School Textbooks in Croatia—1980s to 2000s

The author analyses the discourse on the Ottomans in Croatian history textbooks during the last decade of Socialist rule in the 1980s, the decade of nationalist revival in the 1990s and the decade of the normalization in 2000s and establishes the connections between dominant Croatian ideologies at that time, the historiography and the textbooks. The history textbooks in Croatia during the socialist period (1945–1990) in Yugoslavia continued the anti-Ottoman narrative defined as late as the end of nineteenth century by Croatian nationalist historiography. The discourse was mainly focused on the allegedly unfavourable economic position of Christians during the Ottoman rule and the common plight of Croats and other Southern Slavs. During the nationalistic period of the Franjo Tu?man regime in the 1990s the discourse in the history textbooks remained negative, concentrating on the damage that was inflicted by Ottoman expansion solely to Croatian nation, the state and Catholic faith. After the nationalist regime of Franjo Tu?man left power in 1999 and liberal democracy was finally introduced, Croatian textbooks started to present the Ottoman conquests in a more neutral language and Ottoman Muslim civilization received more nuanced treatment.     

Child Sexual Abuse News: A Systematic Review of Content Analysis Studies

Public knowledge and attitudes toward child sexual abuse are shaped through media depictions and coverage. Since the media are the main source of information about child sexual abuse, studies of child sexual abuse news can help us understand how news is created, how child sexual abuse is presented to the public, and what is the possible impact of such presentation and coverage on the audience. A systematic review of content analysis research is conducted using predefined criteria in order to identify quality studies, main findings, research gaps and to develop recommendations for future studies. International databases were systematically searched using keywords in September 2017. A total of 24 original quantitative content analysis studies published in the English language were included in the review and evaluated according to research methodology. The framework of child sexual abuse news media studies is developed and main findings are highlighted: (1) presentation and coverage of child sexual abuse (n = 7); (2) prevalence of coverage of CSA cases reported to the authorities (n = 2); (3) presentation and coverage of child abuse and sexual crimes where child sexual abuse is only a subtopic (n = 9); (4) presentation and coverage of specific child sexual abuse cases or issues (n = 6). Although studies represent valuable contribution, most did not meet content analysis design and reporting standards or both (e.g., calculating intercoder reliability), which seriously compromises validity and replicability requirements. Recommendation for future studies and most common errors in conducting content analysis are emphasized.     

The potential of Web sites as a relationship building tool for charitable fundraising NPOs

The Internet and especially the new challenges within Web 2.0 provide organizations with the possibility of encouraging two-way communication and engaging publics in dialogue. Charitable fundraising nonprofit organizations (NPOs) can particularly benefit from the Web's relationship building potential. This study aims to explore the potential of Web sites as an online-communication tool of Swiss NPOs. Via content analysis, the Web sites of 134 Swiss charitable fundraising NPOs were examined in order to point out how those organizations are using the Web to create dialogic relationships with their most important stakeholder groups, which are potential donors and the media. Results indicate that the potential of the Internet for dialogic communication is not used efficiently by most NPOs. Nevertheless, NPOs seem to be acknowledging the importance of engaging publics in dialogue, as most of them replied to information requests from potential donors and the media.¹