Graphical Display of Means

A graphical procedure for the display of treatment means that enables one to determine the statistical significance of the observed differences is presented. It is shown that the widely used least significant difference and honestly significant difference statistics can be used to construct plots in which any two means whose uncertainty intervals do not overlap are significantly different at the assigned probability level. It is argued that these plots, because of their straightforward decision rules, are more effective than those that show the observed means with standard errors or confidence limits. Several examples of the proposed displays are included to illustrate the procedure.     

End‐of‐Sample Instability Tests

This paper considers tests for structural instability of short duration, such as at the end of the sample. The key feature of the testing problem is that the number, m, of observations in the period of potential change is relatively small—possibly as small as one. The well‐known F test of Chow (1960) for this problem only applies in a linear regression model with normally distributed iid errors and strictly exogenous regressors, even when the total number of observations, n+m, is large. We generalize the F test to cover regression models with much more general error processes, regressors that are not strictly exogenous, and estimation by instrumental variables as well as least squares. In addition, we extend the F test to nonlinear models estimated by generalized method of moments and maximum likelihood. Asymptotic critical values that are valid as n→∞ with m fixed are provided using a subsampling‐like method. The results apply quite generally to processes that are strictly stationary and ergodic under the null hypothesis of no structural instability.     

Parental Depression in the Context of Divorce and the Impact on Children

The impact of divorce on children has been well documented over the past 30 years. Divorcing parents who are also experiencing clinical depression often have a compromised ability to parent well and to give the children needed support. Children are then impacted both by the divorce itself and the effects of parental depression. They are at higher risk of numerous problems including poorer physical health, deficits in academic performance not attributable to intellectual limitations, poor social functioning, conduct disorder and other disruptive behavior problems, phobias, and other anxiety disorders. Because children of depressed parents are at higher risk for depression themselves, they should be monitored for depressive symptoms. If there are concerns, the child should be assessed by a mental health professional.     

An Exploratory Study of Substance Abuse Among Latino Older Adults

ABSTRACT

Substance abuse among older adults is on the rise. Of particular concern is the increase in alcohol and drug use predicted among Latino elders, expected to result from an upsurge in the Latino population and concurrent growth in the number of older adults. Providing effective treatment for this group will require age-specific, culturally competent interventions. However, few studies have focused on geriatric substance abuse among Latinos. This study aims to lay the groundwork for further research by examining perceptions of the problem among treatment providers and researchers in aging and substance abuse. Implications for social work research and practice are addressed.     

Wives who outearn their husbands: A transitory or persistent phenomenon for couples?

In what percentage of married couples do wives outearn their husbands, and, moreover, how persistent are these patterns? This study systematically examined variation in point-in-time estimates across alternative measures of earnings, definitions of types of couples, and data sources and gauged the persistence of these patterns for a period of three calendar years using data from the 2000 Current Population Survey and the 1996–2000 Survey of Income and Program Participation. Among the findings are that in 19% to 30% of all married couples, wives have higher earnings than their husbands. In 60% of such couples, this arrangement persists over the three-year period; for the rest, this arrangement is transitory.     

What’s keeping you awake at night? Challenges facing trainers in South Africa

Corporate Trainers experience many organizational challenges that require new skills. This qualitative study sought to determine the challenges faced by South African Education Training and Development university students employed as trainers in corporate roles. Findings suggest that trainers require contextual and generic soft skills to meet the requirements of their jobs and that the term trainer embraces a variety of roles of different focus and different status. While there appear to be a common set of problems facing trainers irrespective of location, the interventionist skills and employment policies of the South African government have an important influence on activity in the organization.     

Cross‐Section Regression with Common Shocks

This paper considers regression models for cross‐section data that exhibit cross‐section dependence due to common shocks, such as macroeconomic shocks. The paper analyzes the properties of least squares (LS) estimators in this context. The results of the paper allow for any form of cross‐section dependence and heterogeneity across population units. The probability limits of the LS estimators are determined, and necessary and sufficient conditions are given for consistency. The asymptotic distributions of the estimators are found to be mixed normal after recentering and scaling. The t, Wald, and F statistics are found to have asymptotic standard normal, χ², and scaled χ² distributions, respectively, under the null hypothesis when the conditions required for consistency of the parameter under test hold. However, the absolute values of t, Wald, and F statistics are found to diverge to infinity under the null hypothesis when these conditions fail. Confidence intervals exhibit similarly dichotomous behavior. Hence, common shocks are found to be innocuous in some circumstances, but quite problematic in others. Models with factor structures for errors and regressors are considered. Using the general results, conditions are determined under which consistency of the LS estimators holds and fails in models with factor structures. The results are extended to cover heterogeneous and functional factor structures in which common factors have different impacts on different population units.