Erlang–Lindley distribution

In this paper, Erlang–Lindley distribution (ErLD) is proposed which offers a more flexible model for waiting time data. It has the property that it can accommodate increasing, bathtub, and inverted bathtub shapes. Several statistical and reliability properties are derived and studied. The moments, its associated measures, and the limiting distributions of order statistics are derived. The model parameters are estimated by maximum likelihood and method of moments. An application of the proposed distribution to some waiting time data shows that it can give a better fit than other important lifetime models.     

“Build a friendship with them”: The discourse of “at‐risk” as a barrier to relationship building between young people who trade sex and social workers

Young people in statutory care and protection interact with social workers, who hold potential to provide a supportive adult role in their lives. Many however, run away at an early age and end up on the street trading sex for money or other favours. There is potential to improve outcomes for young people in care if the relationship between young people and their social workers is better addressed. This paper uses data from a qualitative study of 14 young people who traded sex and who had experienced interactions with social workers. A thematic analysis identified three themes: the rigidity of social work practice; contesting the family situation; and resisting the at‐risk label. We argue that to have any impact on outcomes for young people in care, social workers need to prioritise relationship‐building above the need to conform to organizational protocols and guidelines. Such guidelines assist the social worker in assessing whether family situations pose high risk for a young person, but the “at‐risk” label is contested by young people, which results in a lack of trust and a barrier to relationship building.     

Planners’ Perspectives on Governing and Producing Sustainable Cities in Malaysia

Since the mid-1990s, sustainable principles have been embedded in Malaysia’s development plans. The assumption has been that policies, programs, and plans that promote good communities—requiring a mix of housing types, uses, and densities—will produce sustainability. This study examines planning policies and interviews data with local planners to understand the challenges in interpreting and implementing a sustainability agenda in practice. The findings of the study suggest that although planners use various strategies and mechanisms to achieve sustainable cities, problems and barriers limit efforts to produce sustainable cities. Planners have reached a consensus on the need to improve current practice in producing sustainable cities and find effective solutions to deliver good governance practices. The weak commitment of different agencies and leadership, and limited staff resources and unnecessary political intervention, mean that planners in Malaysia face increasing challenges when implementing sustainable cities.

     

Log‐rank permutation tests for trend: saddlepoint p‐values and survival rate confidence intervals

Suppose p + 1 experimental groups correspond to increasing dose levels of a treatment and all groups are subject to right censoring. In such instances, permutation tests for trend can be performed based on statistics derived from the weighted log‐rank class. This article uses saddlepoint methods to determine the mid‐P‐values for such permutation tests for any test statistic in the weighted log‐rank class. Permutation simulations are replaced by analytical saddlepoint computations which provide extremely accurate mid‐P‐values that are exact for most practical purposes and almost always more accurate than normal approximations. The speed of mid‐P‐value computation allows for the inversion of such tests to determine confidence intervals for the percentage increase in mean (or median) survival time per unit increase in dosage. The Canadian Journal of Statistics 37: 5‐16; 2009 © 2009 Statistical Society of Canada     

A new Lindley distribution with location parameter

Abstract

The Lindley distribution has been used recently for modeling lifetime data and studying some stress-strength problems. In this paper, a new three-parameter Lindley distribution is introduced. The added location parameter offers more flexibility in fitting some real data against other common distributions. Several statistical and reliability properties are discussed. A simulation study has been carried to examine the MSE, bias, and coverage probability for the parameters. A real data set is used to illustrate the flexibility of the proposed distribution.     

Limit theory of bivariate dual generalized order statistics with random index

The class of limit distribution functions of bivariate extreme, intermediate and central dual generalized order statistics from independent and identically distributed random variables with random sample size is fully characterized. Two cases are considered. The first case is when the random sample size is assumed to be independent of all basic random variables. The second case is when the interrelation of the random size and the basic random variables is not restricted.     

Efficiency of schemes of sampling from the inverse gaussian-weibull mixture model

The objective of this paper is to study the efficiency of sampling schemes suggested by Hosmer(1973), termed models Ml and M2, relative to the regular random sampling, termed model MO, when samples are drawn from a population having the Inverse Gaussian-Weibull (IG-W) mixture distribution.

It has been shown that whether the efficiency is based on relative variances of the maximum likelihood estimates (ML,E's) of the components of the vector of parameters or on the generalized variances of the MLE's of that vector, Hosmer's models Ml or M2 perform better than model MO.     

(Re)tracing queerness: archiving indentureship’s ‘coolie homo/erotic’

The erotic lifeworld of Indian indentureship remains buried. This visual essay probes the ‘coolie homoerotic’ as a creative reflection on the place of the homoerotic and queerness within the trans-oceanic lifeworld of coolie indentureship. It uses the methodology of visual assemblage to creatively and critically engage with a rare archival record of alleged sodomy on a coolie ship, the Mersey, bound for British Guiana from Calcutta in 1898. The author uses the archival document, as a residue of homoerotic possibility, to re-trace and deliberately reconfigure the historically present narrative of indentureship through a seven-image collection entitled Postcards from the Perineum. In critically responding to Victorian imagery of moral-labour discipline, the postcards were produced using techniques such as photography, sketching, painting, crafting and body printing. The aim is to visually and imaginatively open up a space for contemplating an aesthetic-eroto-political field of knowledge production in relation to the violence and indignities of indentureship. In doing so, the essay also suggests that indentureship is a site of contrapuntal queerness, through which we might critically provoke normative understandings of this term.     

Toward the evaluation of P(X(t) > Y(t)) when both X(t) and Y(t) are inactivity times of two systems

The inactivity time, also known as reversed residual life, has been a topic of increasing interest in the literature. In this investigation, based on the comparison of inactivity times of two devices, we introduce and study a new estimate of the probability of the inactivity time of one device exceeding that of another device. The problem studied in this paper is important for engineers and system designers. It would enable them to compare the inactivity times of the products and, hence to design better products. Several properties of this probability are established. Connections between the target probability and the reversed hazard rates of the two devices are established. In addition, some of the reliability properties of the new concept are investigated extending the well-known probability ordering. Finally, to illustrate the introduced concepts, many examples and applications in the context of reliability theory are included.     

Who Wants to Work for Japanese Companies? A Case in Malaysia

This study examined the factors associated with job‐pursuit intentions for Japanese companies among young, college‐educated Malaysian respondents. Building on the frameworks of Japanese‐style management and the organizational image theory, the study examined the perceived images of Japanese companies and their relations to the actual job‐pursuit intentions among potential job seekers in Malaysia. Using two types of surveys—one based on students (prospective new graduates), and the other based on mid‐career workers—we found that a positive image of Japanese companies’ human resource management was attractive to both types of potential job applicants. Images related to skill training and monetary compensation were more appealing to students, whereas the image of career development was more appealing to mid‐career workers. We also found that Japanese companies tend to attract members of the workforce who are talented in job‐specific skills and professional knowledge in the Malaysian context.