Modified inference about the mean of the exponential distribution using moving extreme ranked set sampling

The maximum likelihood estimator (MLE) and the likelihood ratio test (LRT) will be considered for making inference about the scale parameter of the exponential distribution in case of moving extreme ranked set sampling (MERSS). The MLE and LRT can not be written in closed form. Therefore, a modification of the MLE using the technique suggested by Maharota and Nanda (Biometrika 61:601–606, 1974) will be considered and this modified estimator will be used to modify the LRT to get a test in closed form for testing a simple hypothesis against one sided alternatives. The same idea will be used to modify the most powerful test (MPT) for testing a simple hypothesis versus a simple hypothesis to get a test in closed form for testing a simple hypothesis against one sided alternatives. Then it appears that the modified estimator is a good competitor of the MLE and the modified tests are good competitors of the LRT using MERSS and simple random sampling (SRS).     

Adolescents' Physiological Reactions to Their Parents' Negative Disclosures About the Other Parent in Divorced and Nondivorced Families

The purpose of this study was to determine how adolescents in divorced and nondivorced families respond psychologically and physiologically to their parents' negative disclosures when talking about their parents' relationship. The study also investigated how parents respond to their own disclosures about their relationship with the other parent. In general, the results illustrate the important role that adolescents' feelings of being caught can contribute to their well-being. The findings also supported the hypothesis that the valence of parental disclosures was a more important consideration than its frequency in the understanding of adolescents' reactions to their parents' disclosures, especially for adolescents from divorced families. Disclosure valence was also associated with parental anxiety, such that disclosure negativity predicted elevations in parents' anxiety during the discussion. Ultimately, children from divorced families who already felt caught between their parents and whose parents tended to disclose negative information about the other parent to them were more likely than other adolescents to report feeling anxious during that conversation. The results for changes in physiological arousal were not significant and were not consistent with the results for self-reported anxiety.     

Decision to Emigrate amongst the Youth in Lebanon

This article studies the determinants of youth emigration decisions, which is considered one of the main causes of ‘Brain Drain’ in Arab Mediterranean Countries (AMCs). We focus on the case of Lebanon using a unique dataset covering young people aged 15 to 29 from the year 2016. The aim of the article is to identify the profile of youth's propensity to emigrate from Lebanon. The empirical results indicate that youth from non‐wealthy backgrounds living in smaller dwellings have a higher propensity to emigrate. It is also found that being male and unemployed has a positive effect on migration. Moreover, university education promotes the willingness to emigrate; while residents of poor regions are more likely to express such willingness. Finally, the article provides some insights for policymakers.     

Does China receive more regional FDI than gravity would suggest?

It is an empirical regularity that the activities of multinational corporations are concentrated in their home region. This has been shown to be the case for a majority of the 500 largest multinationals as well as for subsets of this 500 sorted by region or industry. The analysis has also been applied to the activities of a sample of all US and OECD multinationals, aggregated by country. These concentrations have been explained using theories, such as region-bound FSAs which constrain the ability of multinationals to internationalize, as well as transactions costs which make doing business outside a multinational’s home market more costly. To date, there has been no analysis that focuses on the regional and global character of multinational activity destined for China. This paper works to fill that void. Using data on FDI into China from each investor country over the period 1995–2005, this paper documents a significant regional concentration of Asian multinational activity operating within China. This regional concentration is sustained even after the special relationships with Hong Kong and (other) Offshore Financial Centres are accounted for. The evidence therefore extends the evidence of regional concentrations of MNE activities found elsewhere to China and its relationship with Asia.     

RigiScan data under long-term testosterone therapy: improving long-term blood circulation of penile arteries,penile length and girth,erectile function,and nocturnal penile tumescence and duration

Background: Late-onset hypogonadism (LOH) presents with low serum testosterone (TT) levels and sexual and nonsexual symptoms. Erectile dysfunction affects a man’s self-esteem and as a result partner relationship and quality of life.

Objectives: To investigate the andrological clinical profile outcomes of testosterone therapy (TTh) in men (n?=?88) with symptomatic LOH complaints and symptoms.

Main outcome measures: Erectile function was assessed using the International Index of Erectile Function-5 questionnaire at baseline and at 6 and 12 months of TTh. In addition, penile length was measured at baseline and 12 months. We also evaluated nocturnal penile tumescence (NPT, using RigiScan) and blood flow of cavernous arteries (penile Doppler ultrasonography) at baseline and 12 months of TT.

Materials and methods: Eighty-eight LOH men (M_age 51.1 years) with erectile dysfunction, all with serum TT?<10.4?nmol/L before TTh. Patients received intramuscular long-acting testosterone undecanoate for 12 months.

Results: Following TTh, in all patients, serum TT levels were restored within 3 months to normal levels. Compared with baseline values, erectile function significantly improved at 6 (mean score increase 1.95) and 12 months (mean score increase 2.16). No significant changes in penile length were observed. NPT significantly improved at 12 months in terms of both the frequency (mean increase 1.27 times) and duration of rigidity (mean increase 5.12?min). As regards the blood flow of the cavernous arteries, we observed a significant improvement (decrease of 1.16?cm/s) and end diastolic velocity of the penile arteries.

Conclusion: TTh in men with LOH resulted in improvement of the erectile function, NPT, and to some extent the blood flow of the cavernous arteries.     

On the most imbalanced orientation of a graph

We study the problem of orienting the edges of a graph such that the minimum over all the vertices of the absolute difference between the outdegree and the indegree of a vertex is maximized. We call this minimum the imbalance of the orientation, i.e. the higher it gets, the more imbalanced the orientation is. The studied problem is denoted by \({{\mathrm{\textsc {MaxIm}}}}\). We first characterize graphs for which the optimal objective value of \({{\mathrm{\textsc {MaxIm}}}}\) is zero. Next we show that \({{\mathrm{\textsc {MaxIm}}}}\) is generally NP-hard and cannot be approximated within a ratio of \(\frac{1}{2}+\varepsilon \) for any constant \(\varepsilon >0\) in polynomial time unless \(\texttt {P}=\texttt {NP}\) even if the minimum degree of the graph \(\delta \) equals 2. Then we describe a polynomial-time approximation algorithm whose ratio is almost equal to \(\frac{1}{2}\). An exact polynomial-time algorithm is also derived for cacti. Finally, two mixed integer linear programming formulations are presented. Several valid inequalities are exhibited with the related separation algorithms. The performance of the strengthened formulations is assessed through several numerical experiments.     

Family firms and high technology Mergers & Acquisitions

We examine whether family firms undertake value creating high technology M&A. We also examine whether level of ownership, diversification, agency issues and CEO type matter. Our sample consists of high-technology M&A undertaken by Canadian firms over the period 1997–2006. Canada offers a setting with many family firms and the use of control enhancing mechanisms such as dual class shares and pyramid structures. We find a positive relationship between family ownership and announcement period abnormal returns. This relationship, however, starts to decrease at higher levels of ownership but remains overall positive. We also show that the agency conflict between shareholders and professional managers has a detrimental impact on announcement period abnormal returns whereas the conflict between controlling and minority shareholders via control enhancing mechanisms does not. Finally, we document that founder CEO undertake better high tech M&A than descendant or hired CEO.     

Which Neuropsychiatric Disorder Is More Associated With Divorce?

The social disruption experienced by people with neuropsychiatric disorders may be pervasive and manifest in divorce. It has been estimated that 90% of marriages involving a partner with bipolar disorder culminate in divorce. To verify this information we studied the results of the 2004 National Nursing Home Survey. We found that the percentage of divorced residents was 7%. However, “lonesome” status (widowed, divorced, separated, never married, and single) was prevailing in 79% of residents. The rates of divorce were highest among bipolar, paranoid, and schizophrenic residents (18%, 12%, and 12%, respectively). Lonesome status was also highest among bipolar, paranoid, and schizophrenic residents (85%, 84%, and 83%, respectively). Never married status was highest among those with schizophrenia, obsessive-compulsive residents, and bipolar patients (12%, 12%, and 11%, respectively). We conclude that shizophrenic and bipolar patients are very likely to never get married or to end up divorced.     

What Makes Better Boards? A Closer Look at Diversity and Ownership

This study investigates the joint effect of corporate ownership and board of directors' diversity configurations on the success of strategic merger and acquisition (M&A) decisions. Board diversity is defined as the extent to which its demographic diversity as measured by the culture, nationality, gender and experience of its directors complements its statutory diversity. A theoretical framework linking ownership, board diversity and M&A strategic decision making is proposed and tested. Based on a sample of 289 M&A decisions undertaken by Canadian firms over the period 2000–2007, demographic diversity is found to have a clear and non‐linear effect on M&A performance while statutory diversity is of limited influence. Ownership is found to influence the effect of diversity, making the relation finer and more precise. This has practical implications. First, statutory diversity is not sufficient for well‐performing boards. Also, ownership is an important factor. The most advocated board diversity aimed at insuring the board's independence is not valid across all ownership configurations. From a public policy perspective, results provide support for the principles‐based approach in governance. Governance regimes should encourage the search for a balance between board diversity and the need for cohesion that best serves the firm's purpose and obligations.