Selection procedures based on normal and nonnormal variables with single and multiple characters

The performance of selection procedures using a single screening variable are assessed in the presence of nonnormality, in particular mixtures of bivariate normal distributions and the bivariate Edgeworth series distribution.

Screening with multiple characters in the normal situation is studied using principal components.     

Test of independence between tow sets of variates

In this paper asymptotic expansions of the null as well as non-null distributions of the likelihood ratio criterion for testing independence between two sets of variates are obtained. These appear to be better than the ones available in the literature . In factin the null case for p = 1 and p = 2 , t h e expansion reduces to the exact di stribution. In the non-null case, the expansion is given i n terms of non-central beta distributions and for the case when the population canonical correlation coefficients are small.     

That is What a Feminist Looks Like: Identification and Exploration of the Factors Underlying the Concept of Feminism and Predicting the Endorsement of Traditional Gender Roles

Gender Issues - The present studies identified the underlying attitudinal factor structure of the concept of feminism, providing a measure of what it means to be a feminist, and explored the...     

Feasibility and acceptability of using a web-based contraceptive support tool in a university health clinic

Abstract

Objective: To evaluate feasibility of integrating Bedsider.org, a web-based contraceptive decision support tool, at a university health clinic (UHC). Participants: Female students (ages 18–29) seeking contraceptive care at the UHC were enrolled in September 2015 (n?=?46). Methods: Providers recruited eligible patients during reproductive healthcare visits and introduced Bedsider. Surveys were administered immediately following the visit and a follow-up 2–4?weeks later. Electronic health records through 6?weeks post-enrollment were extracted. Results: Most patients had positive views toward Bedsider and appreciated receiving information during their UHC encounters. None were using long-acting reversible contraceptives (LARC) at enrollment. At follow-up, two patients self-reported IUD use. Among those recently sexually active, use of more effective contraceptive methods increased from 65% to 74%; 11% had initiated or were scheduled to receive a LARC. Conclusion: Bedsider can be feasibly integrated into UHC visits and may support women’s selection of more effective contraceptive methods, including LARCs.     

Treatment Experiences of Child Sexual Offenders in Norway: A Qualitative Study

This article is an attempt at gaining a better understanding of treatment of adults who have committed sexual offenses against children. In this study we aimed to explore what people who have committed sexual offenses against children find useful in therapy. The study was approached using qualitative methodology, and information was collected through semistructured interviews. Four male child sexual offenders were recruited from the Institute of Clinical Sexology and Therapy in Oslo, Norway. The informants were interviewed with a focus on what factors they found useful in therapy. Through an explorative, thematic analysis, five main themes were found. These themes include: “Why I started going to therapy,” “Why did I do it?” “Therapy as life,” “Previous and current relationships with others,” and “I lived in a fantasy world where everything was okay.” Based on this study and other earlier studies and theories it appears that the previously mentioned themes recur as important contributory factors in the treatment of child sexual offenders.     

Examining the efficacy of the GameSense gambling prevention programme among university undergraduate students

This article describes a study assessing the effectiveness of a gambling prevention programme, GameSense, in modifying gambling cognitions and intentions among university undergraduate students of diverse ethnicities (N = 122). Although GameSense is a widely used intervention, the effectiveness in modifying gambling cognitions and behaviours has not yet been demonstrated. In the present study, randomly assigned treatment participants completed the programme and then played a gambling game in which they could win tokens for a desired prize. Control participants played the game but did not receive the prevention programme. At the end of the game, all participants completed measures assessing gambling cognitions, immediate and future gambling intentions, and their desire to continue gambling. Programme participants showed increased knowledge about gambling, increased resistance to gambling fallacies, and fewer immediate and future intentions to continue gambling regardless of how much they won or lost, compared to the no-treatment control group. The present results indicate that the GameSense programme is effective in altering cognitions about gambling and immediate and future intentions to continue gambling. Results are discussed in terms of the modification of gambling cognitions following completion of the intervention programme and the changes in future gambling behaviour as a consequence of those changed cognitions.     

VARIANCE ESTIMATION IN TWO-PHASE SAMPLING

Two‐phase sampling is often used for estimating a population total or mean when the cost per unit of collecting auxiliary variables, x, is much smaller than the cost per unit of measuring a characteristic of interest, y. In the first phase, a large sample s₁ is drawn according to a specific sampling design p(s₁) , and auxiliary data x are observed for the units i∈s₁ . Given the first‐phase sample s₁ , a second‐phase sample s₂ is selected from s₁ according to a specified sampling design {p(s₂∣s₁) } , and (y, x) is observed for the units i∈s₂ . In some cases, the population totals of some components of x may also be known. Two‐phase sampling is used for stratification at the second phase or both phases and for regression estimation. Horvitz–Thompson‐type variance estimators are used for variance estimation. However, the Horvitz–Thompson ( Horvitz & Thompson, J. Amer. Statist. Assoc. 1952 ) variance estimator in uni‐phase sampling is known to be highly unstable and may take negative values when the units are selected with unequal probabilities. On the other hand, the Sen–Yates–Grundy variance estimator is relatively stable and non‐negative for several unequal probability sampling designs with fixed sample sizes. In this paper, we extend the Sen–Yates–Grundy ( Sen , J. Ind. Soc. Agric. Statist. 1953; Yates & Grundy , J. Roy. Statist. Soc. Ser. B 1953) variance estimator to two‐phase sampling, assuming fixed first‐phase sample size and fixed second‐phase sample size given the first‐phase sample. We apply the new variance estimators to two‐phase sampling designs with stratification at the second phase or both phases. We also develop Sen–Yates–Grundy‐type variance estimators of the two‐phase regression estimators that make use of the first‐phase auxiliary data and known population totals of some of the auxiliary variables.     

Stochastic comparisons and properties of conditional generalized order statistics

Generalized order statistics introduced by Kamps [1995. A concept of generalized order statistics. J. Statist. Plann. Inference 48, 1–23] provides a unified approach to a variety of models concerning ordered random variables. This paper carries out stochastic comparisons of conditional generalized order statistics in terms of the likelihood ratio order and the hazard rate order from two samples, and establishes some stochastic monotonicity properties. The main results strengthen and generalize the corresponding results established recently in the literature. Finally, some applications of the main results are given as well.