Darling-Erdös-type test for change detection in parameters and variance for stationary VAR models

The aim of this article is the construction of the test statistic for the detection of changes in vector autoregressive (AR) models where both AR parameters and the variance matrix of the error term are the subjects of a change. The approximating distribution of the proposed statistic is the Gumbel distribution. The proof stands on the approximation of weakly dependent random vectors by independent ones and by application of Horváth’s extension of Darling-Erdös extremal result for random vectors, see Darling and Erdös (1956) Darling, D.A., Erdös, P. (1956). A limit theorem for the maximum of normalized sums of independent random variables. Duke Math. J. 23:143–155.[Crossref], [Web of Science ®] , [Google Scholar] and Horváth (1993) Horváth, L. (1993). The maximum likelihood method for testing changes in the parameters of normal observations. Ann. Stat. 21(2):671–680.[Crossref], [Web of Science ®] , [Google Scholar]. The test statistic is a modification of the likelihood ratio.     

Organisation Workshop. Beyond the Workplace: Large Groups,Activity and the Shared Object

Organisation Workshop stands for a body of practice derived from the pioneering work that Clodomir de Morais did with the Brasilian Peasant Leagues starting in the early 1960s and shown to be relevant today in situations of high unemployment. Two essential ingredients are a large group and a common resource pool. The Organisation Workshop method is illuminated by Leontiev’s “objectivised activity” concept, as well as important insights from 3 generations of activity theory (CHAT). Moraisean thought and practice are shown to open up new avenues to community development and to break new ground in the social psychology of the large group.     

Correction to: Analysis of environmental flow requirements for macroinvertebrates in a creek affected by urban drainage (Prague metropolitan area,Czech Republic)

Urban Ecosystems - The original version of this article unfortunately contained errors. The given name and family name of all the authors were interchanged. Dana, Jana and Tomá? are given...     

PI3K pathway and Bcl-2 family. Clinicopathological features in prostate cancer

The phosphatidylinositol 3-kinase (PI3K)/AKT/mTOR pathways and Bcl-2 family play a central role in prostate cancer (PC). The aim was to determine influence in the biochemical progression in PC. To evaluate the association between clinic pathological and immunohistochemical variables, Spearman’s test was performed. Log-rank test and Kaplan–Meier curves were used for survival comparisons. To explore the correlation of the studied immunohistochemical parameters and the established prognostic variables with biochemical progression, univariate and multivariate Cox proportional Hazard regression analyses were performed. Spearman analysis showed correlation between stroma expression and tumor expression of PI3K with biochemical progression (p?=?.009, p?=?.004), respectively, and tumor immunohistochemical score with biochemical progression (p?=?.051). In the multivariate Cox regression model, only PI3K was retained as independent predictors of biochemical progression. In stroma expression, PI3K is (HR 0.172, 95% CI 0.065–0.452, p?=?.000); tumor expression, PI3K is (HR 0.087, 95% CI 0.026–0.293, p?=?.000), and tumor immunohistochemical score (HR 0.382, 95% CI 0.209–0.697 p?=?.002). Our results suggest a role for prostatic expression of PI3K was prognostic markers for PC. PI3K/AKT/mTOR and Bcl-2 family are becoming an important therapeutic target and predictive biomarkers of onset and progression of PC.     

Twitter and video activism as tools for counter-surveillance: the case of social protests in Spain

From a communication perspective, social movements of international significance such as the Arab Spring, Toronto G20, Spanish 15M or Occupy Wall Street have been characterized by the use of mobile communication and social media as tools for video activism and counter-surveillance against the abuse of power committed by the state forces. A representative case of this reality, which reached a high coverage and support in social media environment, can be found in the riots that took place in the Gamonal neighbourhood (Burgos, Spain) in January 2014. In this regard, this article focuses on the denunciation of police violence through video activism by Twitter users during the demonstrations across the country, applying a quantitative–qualitative mixed methodology. First, by means of a content analysis, a sample of 784 tweets linked to videos is analysed in order to identify the main topics and functions of the shared content. Second, a textual analysis of those linked videos of a violent nature recorded by witnesses in order to document police interventions is carried out. The prominent use of Twitter for distributing videos to denounce police violence stands out among the main findings, underlining the audiovisual exposure and ‘secondary visibility’ of the police officers. The results obtained also reinforce the idea of citizen empowerment through the development of an alternative form of journalism, as a practice to criticize the mainstream media coverage of the protests. Additionally, this article sheds light on the open debate about the relevance of social media to encourage citizen involvement in a face-to-face interaction.     

Evaluation of job satisfaction in a sample of Spanish social workers through the ‘Job Satisfaction Survey’ scale

The objective of this study is to determine the level of job satisfaction experienced by social workers and to establish whether there are significant differences between the various levels of job satisfaction and a series of personal features and job characteristics. The participants were 947 social workers (861 women and 86 men) belonging to 35 of the 36 Professional Associations existing in Spain. The measurement tool used is the Job Satisfaction Survey scale, designed by Spector [2002. Psicología Industrial y Organizacional: Investigación y Práctica [Industrial and organizational psychology: Research and practice]. México: Manual Moderno]. The results show that the social workers surveyed experience moderate levels of job satisfaction (M?=?115.8; SD?=?21.4). The intrinsic factor that seems to have the greatest positive influence on job satisfaction is the nature of the job, while the extrinsic factors of pay, fringe benefits, and operating conditions are the ones that contribute most to job dissatisfaction, and social workers have no control over any of them.     

A curious trajectory of interrace relations: the transformation of cosmopolitan Malay port polities into the multiethnic divisions of modern Malaysia

This article aims to examine several interrelated issues pertaining to the historical development of pluralism in areas forming today´s Malaysia. Firstly, it intends to analyze the transformation of the formerly cosmopolitan populations of Malay port polities into the highly ‘racialized’ society of modern Malaysia. It also seeks to clarify the roots of ethnicity-based issues and relations in the country. Lastly, it attempts to challenge the very concept of Malaysia as a society primarily consisting of three ethnic pillars, dominated by the Malays, and ‘complemented’ by the Chinese and the Indians. I argue that the main driving force behind these tensions is the segregational colonial policies and the postcolonial arrangements of the Malay ethnocentrist governments, rather than ethnic and cultural factors as the ruling politicians tend to stress. I also contend that religious issues, especially those stemming from the dakwah movement, are gradually becoming an increasingly important factor in interrace strife.