Age-period-cohort analysis: an illustration of the problems in assessing interaction in one observation per cell data

This paper discusses the specific problems of age-period-cohort (A-P-C) analysis within the general framework of interaction assessment for two-way cross-classified data with one observation per cell. The A-P-C multiple classification model containing the effects of age groups (rows), periods of observation (columns), and birth cohorts (diagonals of the two-way table) is characterized as one of a special class of models involving interaction terms assumed to have very specific forms. The so-called A-P-C identification problem, which results from the use of a particular interaction structure for detecting cohort effects, is shown to manifest itself in the form of an exact linear dependency among the columns of the design matrix. The precise relationship holding among these columns is derived, as is an explicit formula for the bias in the parameter estimates resulting from an incorrect specification of an assumed restriction on the parameters required to solve the normal equations. Current methods for modeling A-P-C data are critically reviewed, an illustrative numerical example is presented, and one potentially promising analysis strategy is discussed. However, gien the large number of possible sources for error in A-P-C analyses, it is strongly recommended that the results of such analyses be interpreted with a great deal of caution.     

A comparison of random balance and two-stage group screening designs: A case study

In this paper we focus on the problem of supersaturated (fewer runs than factors) screening experiments. We consider two major types of designs which have been proposed in this situ¬ation: random balance and two-stage group screening. We discuss the relative merits and demerits of each strategy. In addition, we compare the performance of these strategies by means of a case study in which 100 factors are screened in 20,42,62, and 84 runs.     

Random sampling from the watson distribution

An envelope-rejection method is used to generate random variates from the Watson distribution. The method is compact and is competitive with, if not superior to, the existing sampling algorithms. For the girdle form of the Watson distribution, a faster algorithm is proposed. As a result, Johnson's sampling algorithm for the Bingham distribution is improved.     

An Interesting Property of the Sample Mean under a First-Order Autoregressive Model

The unweighted sample mean is examined as an estimator of the population mean in a first-order autoregressive model. It is demonstrated that the precision of this estimator deteriorates as the number of equally spaced observations taken within a fixed time interval increases.     

The Digital Divide: Couple and Family Therapy Programs’ Integration of Teletherapy Training and Education

The mental health field is increasingly integrating and growing a teletherapy presence, and couple and family therapists are uniquely situated to offer these services based on our history of innovative approaches to therapeutic services. To do so successfully, careful consideration of training and education must occur. To evaluate current teletherapy training and education opportunities of COAMFTE accredited couple, marriage, and family therapy programs, an inductive qualitative content analysis was conducted on the responses of 95 faculty at COAMFTE accredited programs. Findings indicate that more than two thirds of the participants were in favor of teletherapy integration in training programs; however, most programs currently do not offer such opportunities. Barriers that prevent such integration were highlighted as well as existing concerns to training graduate students in teletherapy. Implications for training programs, policies, and regulations are discussed.     

Critical Business Ethics: From Corporate Self‐interest to the Glorification of the Sovereign Pater

Research in critical business ethics has demonstrated how economic self‐interest is the primary reason that businesses adopt nominally ethical practices. After reviewing this body of research, the authors propose that it can be further developed by questioning its conception of self‐interest, by exploring its non‐economic dimensions and by reconsidering the meaning of the ‘self’ that is said to have such interests. Drawing insights from feminist theory and political theology, the paper interrogates corporate business ethics as a public glorification of corporate power based on a patriarchal conception of the corporation. Genealogically rooted in early Christian ceremonial practices used to glorify God the Father, this is a glorification for the sake of glory rather than just for the sake of commercial ends. The authors further argue that corporate business ethics is rendered as the feminized servant of the sovereign corporate patriarch, always at hand to glorify the master. The meaning of corporate business ethics is hence one where the feminine is not absent, but rather is servile to a masculinity conceived in relation to domination, greatness and sovereignty. Collectively, this shows how the power wielded and desired by corporate business ethics far exceeds the pursuit of financial self‐interest; it is also related to modelling the corporation on a male God. The paper concludes by considering how research in critical business ethics can be extended through forms of inquiry that destabilize the ethical glorification of the corporation, and displace its masculinist privilege.     

Personal Network Correlates and Predictors of Homelessness for Injection Drug Users in Baltimore, Maryland

Injection drug users are at high risk for homelessness and human immunodeficiency virus (HIV) infection. This study sought to examine incidence rates and the social and economic antecedents of homelessness of impoverished inner-city injection drug users. Of the 569 participants, from a nontreatment sample who participated HIV prevention study, interviewed at baseline, 324 (57%) were reinterviewed 5.2 months later. At baseline 48% of the participants reported that they had been homeless in the past 10 years. Of the 324, 18% reported that at both interviews they had been homeless within the prior 6 months, 12% reported homelessness at baseline but not at follow-up, and 8% reported homelessness at follow-up but not at baseline. At baseline personal social support network characteristic of size of material aid and size of sex network was found to be associated with self-reports of homelessness. Baseline reports of presence of mother in personal network, size of material aid network, and network density were found to be associated with reports of homelessness at follow-up. These result suggest the need for alternative approaches to addressing issues of homelessness injection drug users.