A test for fractional cointegration using the sieve bootstrap

The concept of fractional cointegration (Cheung and Lai in J Bus Econ Stat 11:103–112, 1993) has been introduced to generalize traditional cointegration (Engle and Granger in Econometrica 55:251–276, 1987) to the long memory framework. In this work we propose a test for fractional cointegration with the sieve bootstrap and compare by simulations the performance of our proposal with other semiparametric methods existing in literature: the three steps technique of Marinucci and Robinson (J Econom 105:225–247, 2001) and the procedure to determine the fractional cointegration rank of Robinson and Yajima (J Econom 106:217–241, 2002).     

Hidden dangers among circuit parties—A systematic review of HIV prevalence,sexual behaviors and drug abuse during the biggest gay events

ABSTRACT

Circuit parties (CP) are extended celebrations, lasting from a day to a week, primarily attended by gay and bisexual men in their thirties and forties. The increasing popularity of circuit parties may play a significant role in the epidemiology of HIV and other sexually transmitted diseases. We performed a systematic literature search in MEDLINE, without any temporal limit, using the term “circuit party”. Only articles reporting cross-sectional studies were analyzed. Ten articles, published in the period from 2001 to 2015 were included in our systematic review and reported data on samples ranging from 173 to 13,883 gay/bisexual men. The HIV prevalence among men who attended the CPs was very high, ranging from 6% to 40.8%. Sexual risk behaviors (e.g. unsafe sex or multiple partners) and drug use were particularly frequent. It wo'uld be useful to promote efficient strategies with the cooperation of party planners, catching the participants before nightlife activities in order to prevent HIV transmission and the use of recreational drugs.     

Nuclear family and social capital of refugees in Austria

This article provides insights into the role of the nuclear family for refugees' social capital in Austria, with a focus on gender-specific differences. We use a multimethod approach, based on quantitative data from a survey with 548 refugees from Syria and Afghanistan and semi-structured group discussions (N = 17 informants). In our analysis, we study frequency of contacts in first language and in German, as proxies for the bonding and bridging social capital. Marital status, childlessness and family work were identified as important factors: Frequency of contact substantially varied by gender and family context. Of all surveyed groups, married childless women and married men with children had the least contacts in both languages. Although an unequal distribution of childcare may limit women's time resources, we observed a positive association between motherhood and frequency of contact in German.