A two-phase sampling scheme and πps designs

A two-phase approach for sampling with unequal inclusions probabilities and fixed sample size is presented. The expansion estimator using target inclusion probabilities is suggested for estimation of population parameters. As an alternative, the estimator for two-phase sampling can be used for estimation. Inclusion probabilities are shown to be asymptotically equivalent to the targeted inclusion probabilities. By means of simulation associated estimators are shown to work well with respect to bias and precision.     

Finite mixture modeling of censored regression models

A finite mixture of Tobit models is suggested for estimation of regression models with a censored response variable. A mixture of models is not primarily adapted due to a true component structure in the population; the flexibility of the mixture is suggested as a way of avoiding non-robust parametrically specified models. The new estimator has several interesting features. One is its potential to yield valid estimates in cases with a high degree of censoring. The estimator is in a Monte Carlo simulation compared with earlier suggestions of estimators based on semi-parametric censored regression models. Simulation results are partly in favor of the proposed estimator and indicate potentials for further improvements.     

Possibilities for Intervention in Domestic Violence: Frame Analysis of Health Care Professionals’ Attitudes

ABSTRACT. Violence is a serious problem, and social and health care providers are in a key position for implementing successful interventions. This qualitative study of 6 focus groups with professionals (n = 30) examines the health care professionals’ ways of framing a domestic violence intervention. Of special interest here is how professionals see their own roles in the process of recognizing and helping victims of domestic violence. By using Erving Goffman's frame analysis, this study identifies several frames that either: a) emphasize the obstacles to intervention and justify nonintervention, or on the contrary, b) question these obstacles and find justifications for intervention. The possibilities for intervention are further explored by analyzing the ways in which the dynamics between the different frames allow redefinition of domestic violence interventions. Despite the challenges involved in a domestic violence intervention, there seems to be potential for change in personal attitudes and reform of professional practices. The research findings underline the role of social and health care professionals as members of a larger chain of service providers working collaboratively against domestic violence. Implications for practice and directions in policy and future research are suggested.     

Heteroskedasticity in the Tobit model

The paper deals with parameter estimation and the testing of individual parameters in heteroskedastic Tobit models. The statistical properties of semiparametric and maximum likelihood estimators are evaluated. Correspondingt-test statistics are compared. Results from a Monte Carlo experiment indicate that the semiparametric estimator performs relatively better than the maximum likelihood estimator. The associatedt-test statistics appear to perform better than the corresponding maximum likelihood test statistics. *** DIRECT SUPPORT *** A06GP002 00008     

Making Sense of Multi‐Actor Dialogues in Family Therapy and Network Meetings

In recent years, a number of family therapists have conceptualized psychotherapy as a dialogical activity. This view presents family therapy researchers with specific challenges, the most important of which is to find ways of dealing with the dialogical qualities of the multi‐actor dialogues that occur, for example, in family therapeutic conversations. In this article, we propose some preliminary ideas concerning qualitative investigations of multi‐actor dialogues. Our aim is to work toward an integration of Bakhtin’s theoretical concepts with good practices in qualitative research (e.g., dialogical tools and concepts of a narrative processes coding system) in order to make sense of family therapy dialogues. A specific method that we have called Dialogical Methods for Investigations of Happening of Change is described. This method allows for a general categorization of the qualities of responsive dialogues in a single session, and also for a detailed focus on particular sequences through a microanalysis of specific topical episodes. The particular focus is on the voices present in the utterances, the positioning of each speaker, and the addressees of the utterances. The method is illustrated via an analysis of a couple therapy session with a depressed woman and her husband.     

Asymptotic misspecification biases for heckman's two step estimator

Asymptotic bias formulae are obtained for Heckman's two step estimator under misspecification of the single equation Tobit modelj and the two equation sample selection model. Asymptotic biases are also obtained for the ordinary least squares estimator based on uncensored observations only. Omitted variables, errors in variables, and heteroskedasticity are considered as sources of misspecification. The biases are illustrated by numerical examples, in which the Tobit maximum likelihood estimator is also included. Severe consequences for the two step estimator are indicated.