Analyzed 1968 mortality data and comparable 1970 census data for women. Found that women married to younger men tended to live longer than expected while women married to older men tended to die sooner than expected. Two possible explanations are considered: mortality outcomes are predetermined by mate selection, or psychological, social, and/or…

Interventions for a variety of emotional and behavioral problems are commonly delivered in the context of treatment groups, with many using rolling admission to sustain membership (i.e., admission, dropout, and discharge from group are perpetual and ongoing). The authors present an overview of the analytic challenges inherent in rolling group data…

Presents a summary of an earlier monograph on the recruitment and retention of older ethnic minority individuals. Findings suggest that recruitment and retention success occurs when there is a match between the goals of the ethnic minority communities and the research community. (Contains 10 references and 3 tables.) (GCP)

Examined seven-year adolescent panel to determine whether attrition effects varied by type of substance assessed and method of measurement. Found study dropouts were more likely to use substances and reported higher mean use of substances at baseline than stayers; attrition effects varied by substance; and mean use comparisons were more likely to…

Presents formulas for estimating sample sizes to provide specified levels of power for tests of significance from a longitudinal design allowing for subject attrition. These formulas are derived for a comparison of two groups in terms of single degree-of-freedom contrasts of population means across the study timepoints. (Author/SLD)

In a study of economically disadvantaged college freshmen it was found that the only significant differentiating factor between them and the average student was grades. (JD)

This introduction to a special issue describes children's injuries in statistical, historical, and social terms. The following key concepts are presented: (1) Childhood injuries are neither random, unavoidable, nor inexplicable; (2) various disciplines suggest different interventions; (3) individuals or populations may be targeted for prevention…

Data from the Sustaining Effects Study were used to investigate the impact of attrition. Four types of analyses were conducted: estimation of attrition rate by project, estimation of bias by project, prediction of bias at the project level, and estimation of bias associated with alternative aggregation procedures. Effects of attrition varied with…

Findings indicated that as the proportion of nominators declines, sociometric classifications become less accurate. Of the groups usually compared in studies of children's social adjustment, the average and neglected groups appear least resistant, and the rejected group most resistant, to classification errors due to nominator attrition. (RH)

Presents a method for the collection and analysis of collateral data about research subjects (i.e., measurements of events in subjects' lives that may affect outcome measures and/or lead to attrition). A six-step procedure evaluates bias resulting from subject attrition from a study using data from lost and retained subjects. (SLD)

Assesses the reliability of the National Longitudinal Survey of Youth (NLSY) data in terms of attrition patterns, characteristics of attriters and returners, and comparability with the Current Population Survey (CPS). Explores how attrition might corrupt the picture of labor-market experience and attempts to reconcile discrepancies between the CPS…

This brief report provides an update to the analysis of five cohorts of new teachers in the Baltimore City Public School System (1999-2000, 2000-01, 2001-02, 2002-03, 2003-04). Presented here are updated retention figures using Baltimore City Public School System (BCPSS) teacher data for 2004-05, comparing teachers with different certification…

This longitudinal study of beginning teachers in Kentucky yields a number of characteristics useful in identifying persons most likely to obtain and retain teaching positions in secondary education. The Western Kentucky University Teacher Preparation Evaluation Program (TPEP), begun in 1971, follows careers of elementary and secondary school…

This article discusses the limitations of 14 randomized controlled trials of exercise rehabilitation for patients who sustained myocardial infarction. The difficulty of sampling patients and controlling the sample size is discussed and the benefits of pooled statistical evidence are considered. (JL)

Describes common methodological inadequacies in research on treatment of obesity and suggests alternatives. Importance of multiple measurement of outcome is emphasized. Merits of alternative single-subject and between-groups experimental designs are discussed. Reasons for conspicuous lack of long-term follow-ups are analyzed. Recommendations for…