A test statistic to choose between Liu-type and least-squares estimator based on mean square error criteria

In this study, the necessary and sufficient conditions for the Liu-type (LT) biased estimator are determined. A test for choosing between the LT estimator and least-squares estimator is obtained by using these necessary and sufficient conditions. Also, a simulation study is carried out to compare this estimator against the ridge estimator. Furthermore, a numerical example is given for defined test statistic.     

Coping Strategies and Depression Among College Students Following Child Sexual Abuse in Turkey

The objective of this study was to investigate the relationship between type of coping style and depression in college students with child sexual abuse experience. A total of 1,055 college students completed self-report measures to assess depressive symptoms, coping strategies, and child sexual abuse history. This study was conducted with a subset of 125 college students who reported that they had been sexually abused in childhood. They were divided into depressive and nondepressive groups according to their depressive symptoms. Data was collected with the Childhood Sexual Abuse Measurement, the Beck Depression Inventory, and the Coping Styles of Stress Scale. Family characteristics were measured with a demographic questionnaire. Analyses involved multiple regression to test for predictive effects. Among college students with child sexual abuse histories, parental education level and both problem-focused and emotion-focused strategies significantly explained depression scores.     

Erectile dysfunction is a marker for obstructive sleep apnea

Purpose: To investigate the prevalence of erectile dysfunction (ED) in patients with obstructive sleep apnea (OSA) with and without any other comorbidities.

Methods: The patient group was newly diagnosed as having OSA (apnea–hypopnea index [AHI]?>?5/h) using a polysomnographic examination. A group of subjects with simple snoring were included into the control group. Clinically relevant comorbidities were systematically assessed in face-to-face interviews. All patients were asked to complete the 15-item International Index of Erectile Function (IIEF-15) questionnaire for the evaluation of ED. The patients with OSA and ED were evaluated according to these comorbidities.

Results: Of the 94 patients, 39 patients were excluded because of severe diseases. OSA was observed in 38 (69.1%) of the 55 patients. ED was seen in 24 (63.2%) patients with OSA, and in 8 (47.1%) patients without OSA (p?>?0.05). There were no statistical differences between the groups’ ages, IIEF scores, and body mass index (BMI) scores. There were statistically significant differences between the groups’ AHI scores (p?p?Conclusion: The rate of ED was higher in patients with OSA who had no other comorbidities. Therefore, ED can be a sensitive marker of OSA.     

A Midsummer Night’s Coup: Performance and Power in Turkey’s July 15 Coup Attempt

Occurring at a time when military interventions appeared to be a matter of the past, the coup attempt of July 15, 2016 left a major mark on Turkish society and politics. This article approaches the July 15 coup attempt as a contingent and transformative event and investigates how symbolic processes helped determine its immediate outcome as well as its cultural, social, and political consequences. Linking the sociological literature on events with social performance theory, the study argues that the putschists’ ineffectiveness in projecting legitimacy and power in the critical hours of the coup attempt significantly contributed to its failure. The retrospective construction of an authoritative “Narrative of July 15” in the following weeks, on the other hand, enabled the government to implement specific institutional changes in the cultural, economic, and political domains. The study proposes a two-step analysis for the cultural construction of political events and suggests that social performance theory provides useful analytical tools for tracing the course and explaining the outcome of this process.     

Boundaries of middle‐class identities in Turkey

The aim of this paper is to provide an analytical account of the diversity within middle‐class identities in Turkey by drawing on an inductive and interview‐based investigation of boundary‐making processes. Inspired by Lamont's framework, it explores the nature and content of drawn symbolic boundaries and relates the causes of the observed variations to the rapid changes in Turkey's socio‐economic structure. The research challenges the homogeneous and strictly hierarchical reading of class/cultural distinctions as it demonstrates the existence of horizontal tensions and culturally inclusive middle‐class repertoires. The analysis unpacks the material basis of differentiation and highlights the most significant factors in strengthening or weakening cultural boundaries in the Turkish case: mobility profiles into middle‐class positions, composition of overall capital and the sector of employment. The paper contributes both to the growing interest in divergent manifestations of class distinction in non‐Euro‐American national contexts and to our understanding of middle‐class cultures in Turkey.     

Lifetime of Prevalence and Risk Factors of Problem and Pathologic Gambling in North Cyprus

In this article, the results of the national survey of adult gambling behavior in North Cyprus (NC) in 2012 are presented. The aim of this study is to investigate the characteristics of adults’ participation in gambling, and to determine the prevalence of ‘problem and pathological gambling’ in NC. The population of this study was formed from all the people living permanently in NC, speaking Turkish, and within the age group 18–65. Household interviews were conducted with 966 people. To obtain data, a 30 item questionnaire prepared by the researchers and a Turkish version of the Revised South Oaks Gambling Screen were used. Prevalence rates are compared with the results of the study conducted in 2007 using the same methodology and survey form. The lifetime prevalence of participating at least once in any of the 17 gambling activities investigated in the survey was 66.4 %. 3.5 % of the respondents scored as lifetime probable pathological gamblers and 9.2 % as probable problem gamblers. Risk factors for becoming probable problem and pathological gamblers include being male, being in the 19–28 age group, having a high education level, having a job and being born in Cyprus. This study shows that the prevalence of problem gambling is high in NC and increasing gradually. NC has socio-cultural features such as a history of colonization, socioeconomic problems and high unemployment, similar to other high prevalence gambling regions, which is suggestive of the importance of socio-cultural factors on gambling behavior.     

A novel feature selection scheme for high-dimensional data sets: four-Staged Feature Selection

Classification of high-dimensional data set is a big challenge for statistical learning and data mining algorithms. To effectively apply classification methods to high-dimensional data sets, feature selection is an indispensable pre-processing step of learning process. In this study, we consider the problem of constructing an effective feature selection and classification scheme for data set which has a small number of sample size with a large number of features. A novel feature selection approach, named four-Staged Feature Selection, has been proposed to overcome high-dimensional data classification problem by selecting informative features. The proposed method first selects candidate features with number of filtering methods which are based on different metrics, and then it applies semi-wrapper, union and voting stages, respectively, to obtain final feature subsets. Several statistical learning and data mining methods have been carried out to verify the efficiency of the selected features. In order to test the adequacy of the proposed method, 10 different microarray data sets are employed due to their high number of features and small sample size.     

MARS as an alternative approach of Gaussian graphical model for biochemical networks

The Gaussian graphical model (GGM) is one of the well-known modelling approaches to describe biological networks under the steady-state condition via the precision matrix of data. In literature there are different methods to infer model parameters based on GGM. The neighbourhood selection with the lasso regression and the graphical lasso method are the most common techniques among these alternative estimation methods. But they can be computationally demanding when the system's dimension increases. Here, we suggest a non-parametric statistical approach, called the multivariate adaptive regression splines (MARS) as an alternative of GGM. To compare the performance of both models, we evaluate the findings of normal and non-normal data via the specificity, precision, F-measures and their computational costs. From the outputs, we see that MARS performs well, resulting in, a plausible alternative approach with respect to GGM in the construction of complex biological systems.     

An Examination of Factors Affecting Economic Status and Finances Satisfaction of Families: A Comparison of Metropolitan and Rural Areas

Research on the family financial management behavior has gained a great impetus over 30 years. There has been a growing interest in the question of how families organize or manage their economic resources and financial satisfaction. The main purpose of this study is to examine factors affecting financial behaviors and financial satisfaction of families who live in metropolitan and rural areas. Participants in the study consist of women who are married and dwelling in Ankara and Karabuk cities of Turkey. A total of 3,046 female (with an approximate 87 % participation rate) are participated in the study on a voluntary (Ankara n = 1,300; Karabuk n = 1,746). Results indicated that 45.4 % of females have determined that economic decision making are always shared by couples (Ankara 41.9 %; Karabuk 47.9 %). Among women who lived in Ankara (62.3 %) have not saving their income, while the group of Karabuk (51.4 %) have sometimes saving. Similar results have been found in terms of the expenditure behaviors among the families who are living in both of the metropolitan and rural areas. The rates of the families living both in Ankara and Karabuk who state that they have become indebted due to various reasons (Ankara 56.5 %; Karabuk 72.9 %) is higher compared to those who state they have not become indebted. Among the females who stated that they are “very dissatisfied” from their savings behavior, “satisfied” with their expenditure behaviors and “dissatisfied” with their debt behaviors are higher percentage (50.6 %, 47.9 %, and 48.3 % respectively).