Book notes

THE SOCIETAL SUBJECT edited by N. Engelsted, M. Hedegaard, B. Karpatscholf, and A. Mortensen. Aarhus: Aarhus University Press, 1993. $26.00.

UNDERSTANDING PRACTICE: PERSPECTIVES ON ACTIVITY AND CONTEXT edited by S. Chaiklin and J. Lave. Cambridge: Cambridge University Press, 1993. $59.95.

THE CULTURAL‐HISTORICAL DEVELOPMENT OF VERBAL THINKING by Peeter Tulviste (Translated by M. J. Hall; Preface by M. Cole). Commack, NY: NOVA Science Publishers, 1991. 183 pp. + notes and references. $39.00.     

Revision of Base Period for General-Purpose Indexes

“It is now about two years since… the proposal to launch a new journal with this title …. [The Editor-in-Chief then] gave it as his opinion that the first number of the new journal could be published by June 1964, and it was with great satisfaction that on the morning of the 30th of June one saw the realisation of his ambition…”     

What the Practitioner Knows Versus What the Client is Told

This article revisits the question, pursued in an interchange between Thomas (1978) and Gambrill and Barth (1980), on whether conflicts exist between service goals and research goals in the use of single-system experimental designs (SSDs) for practice evaluation. The authors approach the issue through an analysis of how informed consent is handled in one widely used textbook promoting the SSD model of practice evaluation. They argue that the text’s suggestions for what to tell the client about reasons for using SSDs ignore knowledge acquisition goals emphasized elsewhere in the text, thus obscuring possible conflicts between the needs of the client and the requirements of SSD methodology. These failures of informed consent reveal largely neglected conflicts between practice and evaluation goals within the SSD model commonly taught to social work students.     

Extremes of Markov chains with tail switching potential

Summary.  A recent advance in the utility of extreme value techniques has been the characteri- zation of the extremal behaviour of Markov chains. This has enabled the application of extreme value models to series whose temporal dependence is Markovian, subject to a limitation that prevents switching between extremely high and extremely low levels. For many applications this is sufficient, but for others, most notably in the field of finance, it is common to find series in which successive values switch between high and low levels. We term such series Markov chains with tail switching potential, and the scope of this paper is to generalize the previous theory to enable the characterization of the extremal properties of series displaying this type of behaviour. In addition to theoretical developments, a modelling procedure is proposed. A simulation study is made to assess the utility of the model in inferring the extremal dependence structure of autoregressive conditional heteroscedastic processes, which fall within the tail switching Markov family, and generalized autoregressive conditional heteroscedastic processes which do not, being non-Markov in general. Finally, the procedure is applied to model extremal aspects of a financial index extracted from the New York Stock Exchange compendium.     

Bayesian methods for generalized linear models with covariates missing at random

The authors propose methods for Bayesian inference for generalized linear models with missing covariate data. They specify a parametric distribution for the covariates that is written as a sequence of one‐dimensional conditional distributions. They propose an informative class of joint prior distributions for the regression coefficients and the parameters arising from the covariate distributions. They examine the properties of the proposed prior and resulting posterior distributions. They also present a Bayesian criterion for comparing various models, and a calibration is derived for it. A detailed simulation is conducted and two real data sets are examined to demonstrate the methodology.     

Family Dilemmas and Secrets: parents' disclosure of information to their adult offspring with learning disabilities

This paper describes the role parents play in providing knowledge of learning disability to their adult offspring with learning disabilities. Data were derived from an in-depth qualitative study of the nature of parent-adult-offspring co-residence. The findings reveal that while parents recognised and had to deal with the stigma learning disability exerted in their own lives, they had taken steps to prevent their adult offspring from having to deal with similar difficulties. It is argued that it remains the case that learning disability is treated as a stigmatised identity and as such is rendered invisible through the strategic control of information. However, findings point towards the conclusion that there has been a cultural reversal in how this process is managed.     

Using the EM-algorithm for survival data with incomplete categorical covariates

Incomplete covariate data is a common occurrence in many studies in which the outcome is survival time. With generalized linear models, when the missing covariates are categorical, a useful technique for obtaining parameter estimates is the EM by the method of weights proposed in Ibrahim (1990). In this article, we extend the EM by the method of weights to survival outcomes whose distributions may not fall in the class of generalized linear models. This method requires the estimation of the parameters of the distribution of the covariates. We present a clinical trials example with five covariates, four of which have some missing values.     

MODES OF EXPRESSION IN FAMILY THERAPY: A PROCESS STUDY OF ROLES AND GENDER*

Twenty-two two-parent families with a referred adolescent were seen by 11 male and 11 female trainees in family therapy. Mothers, fathers, adolescents, and therapists were rated for verbal expression in affective, behavioral, and cognitive! attributional modes during the first session. Results clearly point to role and content difference in modes of expression. Of particular importance are differences by role which occured as a function of therapist gender. These differences suggest that therapist gender has an impact on family therapists' and family members' verbalizations in first sessions of family therapy.