Classifying weibull populations with respect to a control

This paper is concerned with classifying k Weibull populations by their reliabilities with respect to a control population. He have proposed procedures which can be used for maximum likelihood estimators or simplified linear estimators of the parameters. Estimators are based on type II censored data. The cases considered include unknown shape parameters being equal or unequal. In selected cases, the constants needed for the procedures are tabulated using Monte Carlo methods.     

The Impact of Leadership Characteristics on Corporate Performance

We identify three attributes of a firm that exert significant positive impact on stock return performance of companies. Specifically, quality of management, financial soundness and quality of products/services indicators are critical for successful financial performance. We then discuss the leadership characteristics that are necessary to positively affect these attributes. We believe this information provides insights into the type of leadership characteristics that result in improved financial performance. This revised version was published online in July 2006 with corrections to the Cover Date.     

Gender role attitudes and attitudes to abortion: Are there gender differences?

This study examines gender differences in gender role attitudes and attitudes to abortion in a sample of 141 undergraduate students. Religion and religiosity were treated as covariates. Using the short version of Spence and Helmreich's (1978) Attitudes to Women Scale (AWS) taken from Spence and Hahn [Spence, J. T., & Hahn, E. D. (1997). The Attitudes Toward Women Scale and attitude to change in college students. Psychology of Women Quarterly, 21, 17–34] and the abortion attitudes scale developed by Stets and Leik [Stets, J. E., & Leik, R. K. (1993). Attitudes about abortion and varying attitude structures. Social Science Research, 22, 265–282], we found that females have more liberal attitudes to women and show stronger approval for women's autonomy in abortion decision-making. Given the low internal consistency of this three-item subscale, responses to the individual items were analyzed. More males than females feel that the father should have the right to prevent the mother from having an abortion. Most of the students indicate that the woman should have to tell the father before having an abortion and most disagree that the abortion is entirely a woman's decision. There were no gender differences on the moral acceptability and availability subscales. The overall results reflect somewhat conservative attitudes to women, and seemingly contradictory findings on the abortion issue in this sample of university students. Although they endorse the availability of abortion, at the same time they find it morally unacceptable and show weak support for women's autonomy in this decision. The implications of these findings for the advancement of women's rights in this country are discussed.     

A mixed methods inquiry of caregivers of U.S. veterans with sustained “invisible” injuries from Iraq/Afghanistan

ABSTRACT

An exploratory study of caregiver burden associated with family caregivers enrolled in the VA Caregiver Support Program who assist veterans with serious invisible injuries sustained post September 11, 2001. A mixed methods analysis was completed with a retroactive chart review of already collected data (172 participants) in addition to a phenomenological query of 16 participants. Results: T-tests resulted in a significantly higher caregiver burden score with caregivers who had children in the home (M = 6.84; SD = 3.21) versus those who did not (M = 5.57; SD = 2.75), t (160) = ?2.36, p = .02. An ANOVA across caregiver role (parent, spouse, significant other and other) and the Zarit Burden Inventory (ZBI) resulted in a significant difference (F [3, 159] = 1.59, p < .01, with spousal caregivers having a significantly higher ZBI score (M = 6.83; SD = 3.10) than parental caregivers (M = 4.46; SD = 2.70). The phenomenological research resulted in 22 major themes (family adjustment, subjective demands, coping techniques, social support, VA/DOD, self-care, intimacy, role strain, financial resources, life course, obligation, rewards, isolation/loss of self, reciprocity, stigma, community resources, spiritual support, tools, hope, uncertainty, guilt, leash syndrome) which supported quantitative findings. Conclusions: Caregivers and their families had a difficult time adjusting post injury. Caregivers relied heavily on their own coping mechanisms to adapt to their new role and did not find social support to be helpful with caregiving. Spousal caregivers and caregivers with children in the home had more difficulty adjusting when compared with parental caregivers.     

Bayes Estimation of Shift Point in Normal Sequence and Its Application to Statistical Process Control

A sequence of independent observations X ₁, X ₂, …, X _m , X _m+1, …, X _n was observed on some measurable characteristic X in statistical process control. The shift in process mean is reflected in the sequence after X _m . The Bayes estimators of shift point m, and past and future process means, μ₁ and μ₂, are derived using various priors and loss functions. An application in statistical process control is given and a simulation study of the estimators is carried out.     

Step-wise screening of defective factors

It is generally assumed that the defective factors of a population have the same a-priori probability of being defective. However,with some knowledge of the population, we can relax on this assumption and assume the population may consist of factors with unequal a-priori probabilities of being defective. Step-wise screening is developed to detect these factors with minimum expected number of runs assuming that there are no errors in the observationso Comparison is done with an equivalent two-stage group screening experiment.     

Young urban adults' heterosexual risk encounters and perceived risk and safety: a structured diary study

Using diary methods, the current study explored characteristics of young adults' sexual risk interactions over a two-week period and the associations between perceived risk and safety with regard to these sexual risk behaviors. We screened all participants to ensure a moderate to high scores on an HIV knowledge measure. Men (n = 44) and women ( n = 48) enrolled at an inner-city college collected diary data, generating reports of 440 sexual occasions over a 2-week period (1,278 person-days). Despite participation in sexual risk activities, including highly inconsistent condom use during intercourse, participants uniformly reported high safety and little to no risk. Only women's perceptions of safety (not risk) were associated with condom use, men's perceptions of both safety and risk were unrelated. Ratings of safety and risk appeared to operate independently for the most part. Sex with new partners and new sexual activity were associated with both judgments of greater risk and lower safety were associated for men only. These results add to the growing evidence that young people fail to integrate fully their general knowledge regarding HIV risk into their personal interactions. This study has implications for the development of cognitive models around sexual decision-making for young adults at risk for HIV and may provide insight into the contextual features of sexual interactions associated with young people's perceptions of risk and safety.     

Projecting populations for major Pacific Island countries with and without COVID-19: pro-active insights for population policy

Journal of Population Research - The paper projects aggregate populations of six Pacific Island countries in both pre- and post-COVID19 scenarios using a Cohort Component Method for the period...