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Some parameters and techniques in use for describing the results of tests on IR systems are analysed. Several considerations outside the scope of the usual 2 x 2 table are relevant to the choice of parameters. In particular, a variable which produces a ‘performance curve’ of a system corresponds to an extension of the 2 x 2 table. Also, the statistical relationships between parameters are all‐important. It is considered that precision is not such a useful measure of performance (in conjunction with recall) as fallout. A more powerful alternative to Cleverdon's ‘inevitable inverse relationship between recall and precision’ is proposed and justified, namely that the recall‐fallout graph is convex.

The dominant view of laissez-faire leadership has so far been avoidant or regarded as zero leadership. Consequently, it has been suggested that laissez-faire leadership is likely to lead to negative consequences in subordinates’ performance and attitudes. The purpose of this paper is to argue that this conventional view is biased from the start as it is burdened with the concept that laissez-faire leadership is non-strategic and therefore implies negative consequences. This paper further argues that to be able to unveil the real outcomes of laissez-faire leadership, focus should shift to the behavioral aspect of laissez-faire leadership, or non-involvement of a leader/leadership.

This conceptual presentation and presented propositions could stimulate the examination of laissez-faire leadership in more balanced ways.

Shifted focus to the behavioral aspect of laissez-faire leadership, or non-involvement of a leader/leadership allows this paper to explore possible positive outcomes, especially with consideration with dynamics of time. While extant studies about laissez-faire leadership have been partial to negative consequences, this paper explores different contexts in which laissez-faire leadership could be positive.

This paper is one of the first attempts to tease out possible outcomes of laissez-faire leadership, which could be not just negative, by adapting the behavioral aspect of non-involvement of a leader.

Problematic substance use is associated with adverse outcomes that extend beyond the individual, resulting in significant cost to the community through health care, criminal justice and other psychosocial factors, including child protection and family support. These factors create concerns for treatment services, with an increasing demand for cost‐effective solutions to this problem. This paper seeks to address these issues.

This prospective cohort study examined the effect of client variables on retention within a short‐term (56 days) modified therapeutic community (MTC) in the Australian Capital Territory. A total of 28 residents (17 males, 11 females) took part in the study, which included quantitative and qualitative measures.

Results demonstrate a trend in favour of dynamic client variables as effective predictors of retention, with substance use severity being a significant predictor (p=0.023, d=0.91). Content analysis demonstrates that those with severe substance use have more intentions to engage in aftercare.

Short term treatments are seen as providing a gateway to further treatment, especially for chronic substance‐using clients.

This chapter explores how the irruption of plastic materials in contemporary society, in the same way that it facilitated a wide range of human activities, eventually degenerated into a global danger through the contamination of rivers and seas, damaging the human food chain. In doing so, the historical background of this situation has been outlined. Moreover, the countries and areas at present that have polluting plastic substances and those that can be most easily recycled is highlighted. It should be noted that it is precisely in the area of recyclability where most hopes have been placed to counteract plastic contamination aimed at avoiding single-use plastic products. Subsequently, the different positions adopted by the members of society on this problem have been described and, by way of example, the state of the situation in a specific country, Spain, has been summarised.

Three years’ uninterrupted, official residence in Denmark enfranchises all immigrants and refugees in Danish local elections. Not all exercise this right, however. Voter turnout for ethnic minorities in the Danish cities of Aarhus and Copenhagen varies significantly according to ethnic group, according to city, and according to gender. The most significant differences emerge because of the collective mobilization of some ethnic groups in the one city or the other. Most groups are also experiencing varying degrees of individual mobilization based on social integration in Danish society. In many ethnic groups, a specific mobilization of women is observed, and young women in particular have a relatively high voter turnout.

Major merits of New Childhood Sociology are that it has introduced into sociology three fundamental points: (a) studying children as social actors, contrary to the view customarily held of them; (b) defining childhood not as a transitional phase, a state that people leave behind, but as a permanent structure of society – wherein, however, constant turnover occurs, so that childhood changes over time and in different types of society (James, Jenks, & Prout, 1998; Qvortrup, 1991, 2004); (c) considering children as essential part of a historically and socially constructed relationship with adults (Alanen, 2001), following the generational perspective already indicated by Mannheim (Mannheim, 1952).

Unemployment is one of the major challenges facing most countries, including Africa as a continent. Seeking how to reduce unemployment, debt, inflation and increase gross domestic product (GDP), foreign direct investment (FDI) and gross capital formation in the continent has been an agenda of governments, policy makers and economists to. This study examines the relationship between economic growth, inflation, debt, FDI, gross capital formation, labor force, population and unemployment in Africa.

An updated panel dataset of 29 African countries was selected from different regions from 1991 to 2019. These countries were selected based on their unemployment, population growth and inflation rates. The Pesaran cross-sectional dependence and panel unit root test (the Dickey–Fuller cross-sectional supplemented and the Im-Pesaran-Shin cross-sectional) were applied. Further, the panel Autoregressive Distributed Lag (ARDL) model (Bounds test) and pooled mean group (PMG) estimator were utilized in this work.

This shows that economic growth, debt, labor force and population have a positive relationship with unemployment in the long run. Therefore, an increase in these variables generates an increase in the selected African countries' unemployment growth. In contrast, inflation, FDI and gross capital formation have a negative relationship with unemployment in the long run, which implies that an increase in these variables reduces unemployment in the selected African countries.

This study has potential limitations because some data from the countries are not up to date and some years are missing from the data.

This study contributes to understanding unemployment and Okun's law in the African economy. This study shows that an increase in economic growth leads to a rise in unemployment, while an increase in inflation leads to a decrease in unemployment.

This paper provides an insight into the major factors that increase and reduces unemployment for government and policy marker to take the adequate measure.

The Islamic financial system consists of three functional areas of Islamic banking, Islamic insurance and the Islamic capital market, which, with its development and progress, has become an important part of the global financial market and as an alternative, efficient financial model in front of the financial system. Takaful insurance is a relatively new but growing sector of the Islamic financial industry. Today, this insurance has attracted the attention of many researchers and executives. To further improve, it is important to identify the key factors according to the demand and also to evaluate their importance. In Iran’s insurance industry, Takaful product has not yet been released, and insurers have recently entered this field. Therefore, the purpose of this paper, an attempt has been made to identify the factors affecting the demand for Takaful insurance in Iran. The results of this research can be useful for policymakers and Takaful providers in formulating appropriate strategies to increase the demand for Takaful insurance.

In this regard, in this research, using library studies, indicators affecting demand were identified. After that, using a field study and distributing a questionnaire among experts in the field of research, the importance of the indicators was analyzed relative to each other and the indicators were ranked based on their importance.

Based on the results, the indicators are divided into five categories of economic, social, demographic, marketing and sales and features of Takaful insurance products.

To the best of the authors’ knowledge, this is the first study regarding the identification and ranking of factors affecting the demand for Takaful insurance in Iran’s insurance industry.

The purpose of this paper is to analyze the impact of the coronavirus (COVID-19) pandemic on participation and time allocated to work from home (WFH) by ethnic/racial group.

The authors employ USA time-use data [American Time Use Survey (ATUS)] for the 2017–2020 period and a parametric approach in their analysis.

Estimates show that the time allocated to WFH increased during COVID-19, especially for women. This increase is likely driven by more workers shifting to WFH (higher participation) rather than by longer hours worked by those who already teleworked. The authors also find relevant differences in the impact of COVID-19 on WFH by ethnic/racial group. Among ethnic/racial groups, only Asians increased WFH compared to White Americans. Within this ethnic group, the authors find significant differences across genders. Asian men increased participation in WFH, whereas Asian women increased both participation and hours worked, compared to White American women. Differences in this racial/ethnic group could be explained by previous research, which demonstrates a higher ability of Asians to perform job tasks remotely. However, this finding could also be attributed to an increase in discrimination during the COVID-19 pandemic.

This paper contributes to the recent and limited literature exploring the heterogeneous impact of COVID-19 on participation and time allocated to WFH by ethnic/racial group. Understanding the mechanisms driving vulnerable populations' abilities to work during socioeconomic downturns is of high policy importance.