Jackknifing the kaplan-meier survival estimator for censored data: Simulation results and asymptotic analysis

It is shown by simulation t h a t the (arc-sine transformation of the) Kaplan-Meier survival estimator for censored data can be usefully jackknifed to give conservative confidence limits for survival probabilities when samples are small (25 and 50). Mathematical demonstration of the asymptotic, large-sample, validity of the jackknife is included.     

The Implications of Demographic-Specific Inflation Rates for Trends in Real Educational Wage Differentials

We use data from consumer expenditure surveys to investigate the impact on trends in real wage differentials of using group-specific price indexes. We find that inflation rates decrease monoton-ically with the education of the household head throughout the 1970s and early 1980s, and real educational wage differentials, calculated using education-specific price indexes, widened somewhat more than nominal differentials. We also find that differences by education level in fuel and energy consumption, whose relative prices increased during the 1970s, account for the majority of the educational index differences.     

Small sample size comparisons of tests for homogeneity of variances by Monte-Carlo

A number of tests are available for testing the equality of several population variances. Some are claimed to be robust. We compared six of those claimed robust procedures by Monte Carlo simulated experiments, particularly for cases of small and unequal sample sizes. Our results show that the jack-knife test compares favorably with the other tests.     

The BMI as a somatotypic measure of physique: A rejoinder to Jeremy E.C. Genovese

In 2008, Maddan, Walker and Miller promoted the use of the Body Mass Index (BMI) as a viable alternative to Sheldon's technique of somatotyping. Utilizing the BMI, Maddan Walker and Miller re-analyzed the original data from the Sheldon studies. This analysis indicated a statistically significant relationship between the two measures of somatotyping. Genovese wrote a response to this work suggesting the BMI is not a useful proxy for somatotyping individuals. We respond to Genovese's critique by providing a full explication of the Sheldon somatoype measure and an analysis of Sheldon's original data accounting for all of the different somatotypes identified. Analyses here indicate that the original somatotype measure was very subjective. Although not without flaws, the BMI provides an objective somatotype measure that is comparable, if not superior, to the measure promulgated by Sheldon.     

Examining the Heterotypic Continuity of Aggression Using Teacher Reports: Results from a National Canadian Study

This study examined the heterotypic continuity of aggression hypothesis (physical to indirect) using independent teacher reports of aggression drawn from a nationally representative sample of 749 Canadian girls and boys. Confirmatory factor analysis using an accelerated longitudinal design confirmed a two-factor model of physical and indirect aggression that was stable across time, but not sex. Mean levels of indirect aggression were highest for girls whereas mean levels of physical aggression were highest for boys. Results of a series of path analyses indicated statistically significant cross-lagged effects that varied by sex. Physical aggression at Time 1 (T1; aged six to nine years) significantly predicted increased levels of indirect aggression at Time 2 (T2; girls only) and Time 3 (T3; boys and girls). Indirect aggression at T1 predicted decreased physical aggression at T2 (boys only) and at T3 (boys and girls). These results offer support for the heterotypic continuity of aggression and underscore the usefulness of teacher reports in studies of childhood aggression.     

Improving Graduation Rates in Drug Court Through Employment and Schooling Opportunities and Medication-Assisted Treatment (MAT)

ABSTRACT

Drug courts have been a key part of the criminal justice system since 1989, and this study contributes to the existing body of research by identifying which participants (n = 248) were most likely to graduate from a drug court in Indiana (United States). Three variables emerged as significant predictors of graduation. First, participants who were employed or were students at the time of admission were nearly 2.5 times more likely to graduate than participants who were not. Second, participants who were using opiates as their primary drug of choice were over 80% less likely to graduate than participants who were using non-opiates as their primary drug of choice. Third, participants who had violations in the first 30 days of the program were nearly 50% less likely to graduate than participants who did not violate in the first 30 days. Offering medication-assisted treatment (MAT), such as methadone, Suboxone, or Vivitrol, to participants who have an opiate use disorder may improve graduation rates for this population. Additionally, graduation rates may also improve by offering more resources to assist participants in gaining and maintaining employment or schooling, and this seems to be especially important within the first month of the program.     

A COMPARISON OF ALTERNATIVE FORECASTING STRATEGIES FOR MULTI-STAGE PRODUCTION-INVENTORY SYSTEMS

In multi-stage production-inventory systems, the demand for precursor items derives from the demand for successor items at the later stages in the system. This paper presents a method for evaluating the performance of two different strategies for forecasting the demand for precursor items. The dependent strategy relies on successor item forecasts to build a precursor item forecast, while the independent strategy relies on the extrapolation of past precursor demand. An expression indicating the conditions under which one strategy is preferred to the other is developed, and the effect of changing these conditions is illustrated with simulation results.     

Continued Development of the Urban Hassles Index: Evolving Examination of Urban Adolescent Stressors

The continued development of the Urban Hassles Index (UHI) as a tool for understanding the exposure of urban adolescents to chronic stressors is expanded to include the severity of each stressor. Coping strategies—positive or negative—in response to stressors is examined. The UHI continues to reflect strong psychometric properties. Exposure to stress is not differentiated by gender; however, findings reflect different coping strategies utilized by gender. Suggestions for improving the UHI along with the importance of continued examination of the chronic stressors and their impact on adolescent developmental milestones are presented.     

Conceptualizing the Scholarship of Teaching and Learning for Social Work Education

The scholarship of teaching and learning (SoTL) has become a significant social movement. The newest Educational Policy and Accreditation Standards of the Council on Social Work Education explicitly identify SoTL as important in advancing social work education. This article considers social work education’s role, relationship, and responsibility in relation to SoTL. Providing a critical understanding of SoTL’s background, the article summarizes SoTL’s history and current status. Next, we explain the rationale for social work education to focus on SoTL. Then, the article provides pragmatic steps and strategies for performing SoTL. The article concludes with a discussion of specific recommendations for social work education in moving forward in the SoTL movement.