Band Spectral Regression with Trending Data

Band spectral regression with both deterministic and stochastic trends is considered. It is shown that trend removal by regression in the time domain prior to band spectral regression can lead to biased and inconsistent estimates in models with frequency dependent coefficients. Both semiparametric and nonparametric regression formulations are considered, the latter including general systems of two‐sided distributed lags such as those arising in lead and lag regressions. The bias problem arises through omitted variables and is avoided by careful specification of the regression equation. Trend removal in the frequency domain is shown to be a convenient option in practice. An asymptotic theory is developed and the two cases of stationary data and cointegrated nonstationary data are compared. In the latter case, a levels and differences regression formulation is shown to be useful in estimating the frequency response function at nonzero as well as zero frequencies.     

Social Work and Interprofessional Education in Health Care: A Call for Continued Leadership

A report from the Interprofessional Education Collaborative and another from the Institute of Medicine cite working as part of interdisciplinary teams as a core proficiency area for improving health care. This article discusses the core competencies of interprofessional education and the essential role for social workers as leaders and facilitators of this practice. Educators will learn how to help students discover the knowledge, skills, and attitudes for successful interprofessional work. Specifically, this article has the following objectives:

1. Discuss essential elements of effective interprofessional practice;

2. Present exemplars of interprofessional education involving social work;

3. Identify the roles for social work in leadership, education, and practice in interprofessional education.

     

Productivity drift in extended learning curves

The pattern of changes in the Extended Learning Curves representing the performance of 114 assembly workers in an electronics firm is examined in terms of changes in productivity drift over long periods of time. It is shown that 2 types of discontinuities can occur. The first consists of a temporary levelling off in productivity followed by a recovery to new higher levels of productivity; the second has a sustained period of negative productivity drift. A number of work facets are statistically tested as possible causes of these patterns of productivity drift, but, the only significant relationship (at P ≤ 0.05 level) is with length of service in job. Some evidence is presented to show that conventional work measurement methods are not effective in terms of assessing the true work output of experienced workers since such workers are able to beat the system by claiming those allowances which are most difficult to cross-check.     

Integration and alternatives: Some current issues in psychoanalytic theory

The first great bridge between psychoanalysis and social work came with the concepts of ego psychology which provided a synthesis between the worlds of the social order and the psychological depths. Current psychoanalytic theorists now question whether any one psychological theory is sufficient to describe the complexity of human experience, and suggest that each theory has a piece of the truth because it states something that is correct about the patient at a particular time in the treatment. Adherence to multiple theories makes a complex problem for the clinical practitioner, who must decide from which perspective to respond to the clinical material of the moment. Psychoanalytic theorists are also questioning the degree to which it is actually the content of the therapist's interpretations which brings about change in the patient. This article suggests that these developments in psychoanalysis, with their emphasis on therapeutic flexibility and the importance of the relationship will renew and reinvigorate the bridge between psychoanalysis and clinical social work.An earlier version of this paper was presented at the First Clinical Conference of the National Federation of Societies for Clinical Social work.     

Vector autoregression and causality: a theoretical overview and simulation study

This paper provides a theoretical overview of Wald tests for Granger causality in levels vector autoregressions (VAR's) and Johansen-type error correction models (ECM's). The theory is based on results in Toda and Phillips (1991a) and allows for stochastic and deterministic trends as well as arbitrary degrees of cointegration. We recommend some operational procedures for conducting Granger causality tests that are based on the Gaussian maximum likelihood estimation of ECM's. These procedures are applicable in the important practical case of testing the causal effects of one variable on another group of variables and vice versa. This paper also investigates the sampling properties of these testing procedures through simulation exercises. Three sequential causality tests in ECM's are compared with conventional causality tests in levels and differences VAR's.     

A bayesian analysis of trend determination in economic time series

In this paper we provide a comprehensive Bayesian posterior analysis of trend determination in general autoregressive models. Multiple lag autoregressive models with fitted drifts and time trends as well as models that allow for certain types of structural change in the deterministic components are considered. We utilize a modified information matrix-based prior that accommodates stochastic nonstationarity, takes into account the interactions between long-run and short-run dynamics and controls the degree of stochastic nonstationarity permitted. We derive analytic posterior densities for all of the trend determining parameters via the Laplace approximation to multivariate integrals. We also address the sampling properties of our posteriors under alternative data generating processes by simulation methods. We apply our Bayesian techniques to the Nelson-Plosser macroeconomic data and various stock price and dividend data. Contrary to DeJong and Whiteman (1989a,b,c), we do not find that the data overwhelmingly favor the existence of deterministic trends over stochastic trends. In addition, we find evidence supporting Perron's (1989) view that some of the Nelson and Plosser data are best construed as trend stationary with a change in the trend function occurring at 1929.     

Influencing Client Expectations About Career Counseling Using a Videotaped Intervention

Realistic client expectations about career counseling are essential to positive client outcomes. The authors investigated a videotaped intervention designed to influence participants' expectations about career counseling using a pretest/posttest experimental design. As measured by the Expectations About Counseling‐Brief Form (H. E. A. Tinsley, 1982), undergraduate participants who watched the videotaped intervention significantly increased their expectations of personal commitment to career counseling and decreased their expectations of counselor expertise compared with participants who watched a control videotape. A secondary hypothesis, that changes in expectations would positively affect attitudes toward career counseling as measured by the Attitudes Toward Career Counseling Scale (A. R. Rochlen, J. J. Mohr, & B. K. Hargrove, 1999), was not supported.