TESTING THE LARGEST OF A SET OF CORRELATION COEFFICIENTS

A previous paper which studied the distribution of the smallest distance between N independent random points on the surface of a sphere is generalised to higher dimensions in order to study the distribution of the largest sample correlation coefficient between a set of independent normally distributed variables. Inclusion-exclusion arguments provide accurate bounds for the tail of this distribution, and by another argument more exact bounds are also found, one of which is an improvement on the result in the previous paper. Bounds are also found for the power of the test against the alternative hypothesis that one only of the population correlation coefficients is non-zero. The test is also shown to be the likelihood ratio test against the latter alternative.     

The modified cognitive constructions coding system: reliability and validity assessments

The cognitive constructions coding system (CCCS) was designed for coding clients' expressed problem constructions on four dimensions: intrapersonal-interpersonal, internal-external, responsible-not responsible, and linear-circular. This study introduces, and examines the reliability and validity of a modified version of the CCCS-a version that involves coding clients' problem constructions at the level of speech turn. Results indicate that the modified CCCS generated reliable ratings of clients' problem constructions in 15 sessions of family therapy. Validity was established by comparing 71 subjects' own ratings of over 250 self-generated problem constructions to the ratings of trained CCCS coders. The modified CCCS allows for identifying moment-to-moment changes in clients' problem constructions and, ultimately, examining the impact of therapist behaviors on such changes.     

Ethical and psychosocial issues raised by the practice in cases of mistreatment of older adults

Intervention regarding older adult mistreatment raises many questions for practitioners. They have to interact with the victim, the abuser, and, in many cases, with both of them at the same time. In such cases, five themes emerge from the literature review on psycho-social and ethical issues in practice: practitioners' pre-construction and axiological frameworks, victims' capacity, confidentiality versus collaboration between practitioners or between agencies, social and family responsibilities and the balance between competing values in practice. Practitioners are well placed to offer a critical reflection on their practice and on ways of improving it. The goal of our qualitative study is to identify issues and ethical dilemmas in elderly mistreatment situations as represented in the discourses of practitioners in reference to interventions in their psychosocial practice. Sixteen practitioners from the public and community (non-profit organization) sectors were interviewed using a practice history approach. This paper presents the main ethical and psychosocial issues raised by practitioners and some ideas to improve the practice. It is motivated by the crucial question haunting the practitioners' minds: "How far should we go?"     

Darling–Erdős limit results for change-point detection in panel data

We wish to test the null hypothesis if the means of N panels remain the same during the observation period of length T. A quasi-likelihood argument leads to self-normalized statistics whose limit distribution under the null hypothesis is double exponential. The main results are derived assuming that the each panel is based on independent observations and then extended to linear processes. The proofs are based on an approximation of the sum of squared CUSUM processes using the Skorokhod embedding scheme. A simulation study illustrates that our results can be used in case of small and moderate N and T. We apply our results to detect change in the “corruption index”.     

The utility of situational theory of publics for assessing public response to a disaster prediction

The study of public response to disasters is a relatively recent discipline that developed following the passage of the Earthquake Hazards Reduction Act of 1977. Because earthquake prediction is an inexact science, few formal predictions have been issued, which has limited the opportunity to study public response to predictions. The purpose of this study was to examine the utility of public relations theory, specifically situational theory of publics, for assessing response to the New Madrid earthquake prediction.Situational theory demonstrates that there is not a single, general public for disaster predictions as has been assumed in studies of disaster response. Instead, multiple publics develop in response to a prediction based on how members of those publics view the situation. Contrary to previous findings that believability and personalized risk are correlated constructs, high personalized risk was associated with high constraint recognition regardless of belief in the prediction. Based on the findings, suggestions are proposed for the development of more effective messages for communicating with publics at risk.     

Nadaraya–Watson estimator for I.I.D. paths of diffusion processes

This paper deals with a nonparametric Nadaraya–Watson (NW) estimator of the drift function computed from independent continuous observations of a diffusion process. Risk bounds on the estimator and its discrete-time approximation are established. The paper also deals with extensions of the PCO and leave-one-out cross-validation bandwidth selection methods for our NW estimator. Finally, some numerical experiments are provided.     

Peer group self-identification in samples of Russian and U.S. adolescents

Most peer group self-identification research has been conducted in the United States. This article examined the generalizability of self-identified group name research among teens in Ufa, a city in the Russian Federation. A cross-sectional, anonymous collection of data on group self-identification, drug use, addiction concern, sensation seeking, and self-rated school performance was collected from 365 10th grade youth in Ufa and 965 10th grade youth in the United States. The results supported the existence of peer group self-identification by youth in both countries and, in general, replicated the findings that youth who self-identify as a High Risk Youth, are relatively likely to use drugs, show greater concern about becoming an addict, report a greater sensation seeking preference, higher levels of depression, and poorer school performance. Implications of these results are discussed.