Improved quality control charts for monitoring the process mean,using double-ranked set sampling methods

Statistical control charts are widely used in the manufacturing industry. The Shewhart-type control charts are developed to improve the monitoring process mean by using the double quartile-ranked set sampling, quartile double-ranked set sampling, and double extreme-ranked set sampling methods. In terms of the average run length, the performance of the proposed control charts are compared with the existing control charts based on simple random sampling, ranked set sampling and extreme-ranked set sampling methods. An application of real data is also considered to investigate the performance of the suggested process mean control charts. The findings of the study revealed that the newly suggested control charts are superior to the existing counterparts.     

The home situation and the homosexual

This article is concerned with the home situation of the homosexual, as a part of the process which develops homosexuality. An exploratory study was conducted in San Francisco on a sample of the homosexual population. Three hypotheses were examined: there is a positive relationship between the incidence of homosexuality and the unhappy childhood of the homosexual at home; there is a positive relationship between the confusion in sexual role‐playing in early ages, and homosexual behavior; and there is a positive relationship between the presence of homosexual family members and the development of new homosexuals. The data were collected in recorded interviews. Fingings tended to suport the first hypothesis, but did not support the second and third hypothesis.     

“¡Chalinas a 20 Pesos!”: Children’s Economic Ideas Developed Through Selling

This article explores the economic ideas of indigenous Triqui children who sold artisanal goods in Oaxaca, Mexico. I approached the investigation of economic ideas by focusing on the ways in which children interacted with customers while trying to sell their goods. Using observations and interviews, I found that as children tried to convince customers to buy goods, they generated spontaneous economic ideas about the value of goods. This study provides an exploratory first step to understanding children’s development of economic ideas through everyday activity and reveals nuances in economic ideas that would otherwise remain hidden.     

Riotous Citizens: Ethnic Conflict in Multicultural Britain

Forest struggles and movements in India were a part of the rich tradition of anti-colonial struggle. In North Bengal, the recorded history of forest movements dates back to the 1960s and the movements themselves have been continuous ever since. However, despite the sincere efforts of those movements the livelihood opportunities of the forest dwellers worsened daily. The 1972 Wildlife Act together with the 1980 Forest Conservation Act strengthened further the oppressive structure of the forest bureaucracy. After the introduction of the Joint Forest Management Programme in the 1990s backed by the 1988 Forest Policy in India, it was expected that the forest dwellers would become more empowered economically and socially in lieu of their participation in the forest protection activities. But this failed miserably in the region and in 2000, against such a backdrop, a movement was started to demand land and livelihood rights for the forest dwellers. Following the Notification of the Forest Rights Act (2006) the movement has gained a new momentum while continuing its struggle against the biased implementation of the Act. This article presents a brief account of the movement in order to assess its significance and changing focuses over the years.     

A Bayesian compartmental model for the evaluation of 1,3-butadiene metabolism

Summary. We propose a Bayesian model for physiologically based pharmacokinetics of 1,3-butadiene (BD). BD is classified as a suspected human carcinogen and exposure to it is common, especially through cigarette smoke as well as in urban settings. The main aim of the methodology and analysis that are presented here is to quantify variability in the rates of BD metabolism by human subjects. A three-compartmental model is described, together with informative prior distributions for the population parameters, all of which represent real physiological variables. The model is described in detail along with the meanings and interpretations of the associated parameters. A four-compartment model is also given for comparison. Markov chain Monte Carlo methods are described for fitting the model proposed. The model is fitted to toxicokinetic data obtained from 133 healthy subjects (males and females) from the four major racial groups in the USA, with ages ranging from 19 to 62 years. Subjects were exposed to 2 parts per million of BD for 20 min through a face mask by using a computer-controlled exposure and respiratory monitoring system. Stratification by ethnic group results in major changes in the physiological parameters. Sex and age were also tested but not found to have a significant effect.     

Social work in a conflict context: Challenges facing social workers with indigenous inhabitants of unrecognised villages in Israel

This qualitative study presents the experiences of social workers whose clients are the inhabitants of unrecognised Bedouin Arab villages in Israel. It used in‐depth, semi‐structured interviews with 25 participants, recruited by the snowball method. These social workers reported that they are caught between their personal and professional values, on the one hand, and employer regulations, government policy and government law, on the other – which greatly limits their ability to fulfil their professional role. The social workers also comment that they are working in a ‘grey area’ in which the government’s policy is unclear. This adds another layer of complexity to their work and reveals the differential implementation of critical social work principles by social workers with different cultural identities.     

A New Discordancy Test in Circular Data Using Spacings Theory

In this article, we propose a new test of discordancy based on spacing theory in circular data. The test should provide a good alternative to existing tests of discordancy for detecting single or well-separated multiple outliers. On top of that, the new method can be generalized to identify a patch of outliers in data. The percentage points are calculated and the performance is examined. We first investigate the performance of the test for detecting a single outlier and show that the new test performs well compared to other known tests. We then show that the generalized test works well in detecting a patch of outliers in the data. As an illustration, a practical example based on an eye dataset obtained from a glaucoma clinic at the University of Malaya Medical Center, Malaysia is presented.     

The Correlated Bivariate Noncentral F Distribution and Its Application

This article proposes the singly and doubly correlated bivariate noncentral F (BNCF) distributions. The probability density function (pdf) and the cumulative distribution function (cdf) of the distributions are derived for arbitrary values of the parameters. The pdf and cdf of the distributions for different arbitrary values of the parameters are computed, and their graphs are plotted by writing and implementing new R codes. An application of the correlated BNCF distribution is illustrated in the computations of the power function of the pre-test test for the multivariate simple regression model (MSRM).