ROBUST ESTIMATION UNDER TYPE II CENSORING

The properties of robust M-estimators with type II censored failure time data are considered. The optimal members within two classes of ψ-functions are characterized. The first optimality result is the censored data analogue of the optimality result described in Hampel et al. (1986); the estimators corresponding to the optimal members within this class are referred to as the optimal robust estimators. The second result pertains to a restricted class of ψ-functions which is the analogue of the class of ψ-functions considered in James (1986) for randomly censored data; the estimators corresponding to the optimal members within this restricted class are referred to as the optimal James-type estimators. We examine the usefulness of the two classes of ψ-functions and find that the breakdown point and efficiency of the optimal James-type estimators compare favourably with those of the corresponding optimal robust estimators. From the computational point of view, the optimal James-type ψ-functions are readily obtainable from the optimal ψ-functions in the uncensored case. The ψ-functions for the optimal robust estimators require a separate algorithm which is provided. A data set illustrates the optimal robust estimators for the parameters of the extreme value distribution.     

Does Australia Have a Filipina Brides Problem?

This paper challenges the assumption that Australian-Filipina marriages are prone to high rates of marital breakdown; and the belief that the incidence of Australian-Filipina marriages is sufficiently large to warrant the introduction of restrictive immigration policies for Filipinas. First we set the problem of Filipina bride migration in perspective by viewing it in the wider context of Australian immigration patterns — something that has been largely neglected in the discussion so far. Then we review the evidence on marital breakdown and show that Filipina-Australian marriages have been more successful than is commonly assumed. Finally, we consider the standard explanation of the breakdown of Filipina-Australian marriages in terms of ‘cultural differences’. Our conclusion is that much of the discussion has been based on implicit racial and sexual prejudices, rather than factual evidence.     

Biological Markers of Environmental and Ecological Contamination: An Overview

An approach, using biomarkers (biological responses) for assessing the biological and ecological significance of contaminants present in the environment is described. Living organisms integrate exposure to contaminants in their environment and respond in some measurable and predictable way. Responses are observed at several levels of biological organization from the biomolecular level, where pollutants can cause damage to critical cellular macromolecules and elicit defensive strategies such as detoxication and repair mechanisms, to the organismal level, where severe disturbances are manifested as impairment in growth, reproduction, developmental abnormalities, or decreased survival. Biomarkers can provide not only evidence of exposure to a broad spectrum of anthropogenic chemicals, but also a temporally integrated measure of bioavailable contaminant levels. A suite of biomarkers are evaluated over time to determine the magnitude of the problem and possible consequences. Relationships between biomarker response and adverse ecological effects are determined from estimates of animal health and population structure.     

A constructivist approach to the help-seeking process of clients: A response to cultural diversity

The issue of cultural diversity presents clinicians with both delemmas and opportunities. To deal with such a challenge, I have proposed a constructivist approach to the help-seeking process of clients from diverse ethnoracial backgrounds. A model of clients' help-seeking processes provides a useful and systematic frame for clinicians to understand clients' construction of their problem situations and possible solutions. It provides a useful key for clinicians non-presumptuously to understand clients' subjective experiences, and to enhance clients' ability to resolve problems.     

The rescission of behaviors: Inconsistent responses in adolescent sexuality data

In longitudinal survey research, certain questions can be rescinded illogically. For instance, respondents who at Time 1 report having had sexual intercourse may at Time 2 report never having done so. This paper reports measurement techniques and analyses of these types of inconsistencies from an ongoing longitudinal adolescent sexuality project. Inconsistencies in intercourse, masturbation, and other sexual behaviors are reported and compared to rates from other studies and other less sensitive behaviors within the same study. Three conclusions are presented: (1) inconsistencies should be considered a natural part of any longitudinal survey process and should be incorporated into the response model; (2) inconsistency rates in these particular data support the contention that adolescent sexuality data of appropriate quality for analytical purposes can be obtained; and (3) inconsistency rates in fact contain substantive information concerning the processes under consideration.     

Talk About Embarrassment: Exploring the Taboo-Repression-Denial Hypothesis

Theory and research suggest that, while embarrassment may be intrinsic to social interaction, its expression is C. taboo. Embarrassment is seen as reflecting social incompetence. As such, members make routine attempts to repress embarrassment in the self and to deny embarrassment to self and others. I call this the taboo–repression–denial hypothesis. However, despite attempts at repression and denial, members reveal embarrassment in a variety of ways, including verbally, paralinguistically/vocally, and facially/bodily. This paper is an initial investigation of emotion denial in verbal discourse. Through an analysis of embarrassment talk and non-embarrassment talk, I discover six features of the verbal context of references to embarrassment which aid in the disguise and denial of feeling: (1) verbal mitigation; (2) a link between references to embarrassment and mitigation; (3) verbal projection; (4) a link between use of “ya know”, embarrassment references, and mitigation; (5) a link between use of “I don't know”, embarrassment references, and mitigation; and (6) a link between references to embarrassment and laughter. Findings indicate verbal and nonverbal methods of emotion denial, and provide initial support for the taboo–repression–denial hypothesis.