Substance Use Disorders in a Sample of Iranian Secondary School Students

Aims: The current research assessed therate of substance use among Iranian secondaryschool students. Participants: 470boy secondary school students selected randomlyand were assessed. Measurements: Aconfidential questionnaire based on DSM-IV anda prior study was distributed, completed by thestudents and collected in the same sessions in2001. Results: Their mean age was13.6 yr., (SD = 0.67) ranging from 12 to 14. Ofthe subjects 105 (22.3%) reported usage ofsubstance (s) once or more sometime duringtheir lives: tobacco 82 (17.5%) alcohol 32(6.8%), opium 3 (–0.6%), hashish 1 (–0.2%), and heroin 2 (0.4%). Only 39 (8.3%) of the students were current substance dependent: 29 (6.2%) were tobacco dependent and 13 (2.8%)were alcohol dependent. Some were using morethan one substance. Conclusions:Tobacco and alcohol were found to be the mostprevalent form of substance use. Seekingpleasure, modeling and release of tension werethe most common reasons for initial substanceuse. The most common reasons reported forcurrent use were seeking pleasure, habit andrelease of tension, respectively. Thesefindings can be implicated in planningpreventive programs. Some of the findings aredifferent from those carried in the west.Cultural attitudes could be the causes of thedifferences.     

Restricting asylum: Trends and prospects

The dramatic rise in asylum applications in industrialized countries during the last decade has resulted in the development of an increasingly restrictive asylum regime. The tools these countries have devised for containing and deterring asylum claims—the concepts of Safe Countries of Origin and Safe Third Countries, Manifestly Unfounded Applications, and numerous administrative measures which act as barriers to entry—are targeted specifically at nationals of countries most likely to produce refugees. Additional pre‐entry measures attempt to make the asylum route as difficult as possible through the use of visa requirements and carrier sanctions. For those asylum seekers who manage to make the journey despite these obstacles, the administrative evaluation of their claims is accelerated, the legal procedures shortened, and the opportunities for appeal reduced. In addition, governments are increasingly resorting to bilateral agreements to ensure the readmission of rejected asylum seekers into the countries from or through which they came. The implementation of these measures in many European countries—but also in North America and Australia—are already well on their way, and the trend toward harmonizing these restrictionist responses is likely to continue. Policy makers need to be reminded of the risks of their policies for the basic tenets of asylum and refugee protection.     

Distribution-free comparison of hazard rates of two distributions under progressive type-II censoring

Some distribution-free tests have been discussed in the literature with regard to the comparison of hazard rates of two distributions when the available samples are complete. We generalize here Kochar's [S.C. Kochar, A new distribution-free test for the equality of two failure rates, Biometrika 68 (1981), pp. 423–426] test statistic to the case when one available sample is progressively Type-II censored, and then derive its exact null distribution and examine its power properties by means of a Monte Carlo simulation study.     

Reducing Periodicity of Fuzzy Markov Chains Based on Simulation Using Halton Sequence

We first introduce fuzzy finite Markov chains and present some of their fundamental properties based on possibility theory. We also bring in a way to convert fuzzy Markov chains to classic Markov chains. In addition, we simulate fuzzy Markov chain using different sizes. It is observed that the most of fuzzy Markov chains not only do have an ergodic behavior, but also they are periodic. Finally, using Halton quasi-random sequence we generate some fuzzy Markov chains, which are compared with the ones generated by the RAND function of MATLAB. Therefore, we improve the periodicity behavior of fuzzy Markov chains.     

Two‐Year Follow‐Up of the Efficacy of the PREP Training on Iranian Newlyweds

The aim of the present study was to replicate the efficacy of the Prevention and Relationship Education Program (PREP) training on marital satisfaction and dyadic adjustment among a group of Iranian newlyweds. One hundred and sixty heterosexual couples (N = 320 participants) were randomly assigned to an experimental or a wait list control group. Data from one hundred and forty‐eight couples were analyzed. Participants completed the ENRICH Marital Satisfaction Scale (The Family Journal, 1, 1993, 196–207) and Dyadic Adjustment Scale (The Journal of Sex Research, 39, 1976, 190–196) at pretest, posttest, 1‐year follow‐up, and 2‐year follow‐up. Results indicated that mean marital satisfaction and dyadic adjustment scores between the experimental and control groups were significantly different at posttest. Therefore, PREP training improved marital satisfaction and dyadic adjustment of couples at posttest. The data suggests that PREP training program can be introduced as an effective relationship education program for Iranian newlyweds.     

Application of Different Techniques of Factor Analysis to Develop Neighborhood Social Capital Rating Scale

Composite indicators are widely used to determine the ranking of countries, organizations or individuals in terms of overall performance on multiple criteria. Their calculation requires standardization of the individual statistical criteria and aggregation of the standardized indicators. These operations introduce a potential propagation effect of extreme values on the calculation of the composite indicator of all entities. In this paper, we propose robust composite indicators for which this propagation effect is limited. The approach uses winsorization based on a robust estimate of the distribution of the sub-indicators. It is designed such that the winsorization affects only the composite indicator rank but has no effect on the entities ranking in each sub-indicator. The simulation study documents the benefits of distribution-based winsorization in the presence of outliers. It leads to a ranking that is closer to the clean data ranking when compared to the ranking obtained using either no winsorization or the traditional winsorization based on empirical quantiles. In the empirical application, we illustrate the use of winsorization for ranking countries based on the United Nations Industrial Development Organization’s Competitive Industrial Performance index. We show that even though the sub-indicator ranking does not change, the robust winsorization approach has a material impact on the ranking of the composite indicator for countries with large discrepancies in the scores of the sub-indicators.

     

The effects of measurement error on the MAX EWMAMS control chart

Recently, some researchers suggested using a single chart to monitor both location and scale parameters for a process simultaneously, in order to resolve some difficulties in control chart interpretation arising from the traditional approach. This study focuses on the Maximum Exponentially Weighted Moving Average and Mean Squared deviation (MAX EWMAMS) control chart in the presence of measurement error. An important issue in using this chart is that measurement error adversely affects the performance of the chart. In this study, we investigate the effects of measurement error on the performance of the MAX EWMAMS chart by calculating and comparing the average time to signal (ATS) associated with both the in-control and out-of-control states.     

On using non identical and independent Bernoulli trials in human surveys

Unlike the usual randomized response techniques, as a pioneering attempt, this article focuses on using non identical independent Bernoulli trials in sensitive surveys. For this purpose, a general class of randomized response techniques is considered. The usual randomized response techniques are based on a fixed probability of having a yes answer. Contrary to usual techniques, in the proposed technique every respondent has a different probability of reporting a yes answer. With this setting, in most of the situations, the proposed technique is observed performing better in terms of variability. To illustrate and support the superiority of the proposed technique it is compared with models such as Warner (1965), Greenberg et al. (1969), Mangat and Singh (1990), and Mangat (1994) using identical Bernoulli trials. Relative efficiency and privacy protection are studied in detail using Warner (1965) and Mangat (1994) models.