A Comparison of Bias Reduction Methods: Clustering versus Propensity Score Subclassification and Weighting

Propensity score (PS) adjustments have become popular methods used to improve estimates of treatment effects in quasi-experiments. Although researchers continue to develop PS methods, other procedures can also be effective in reducing selection bias. One of these uses clustering to create balanced groups. However, the success of this new method depends on its efficacy compared to that of the existing methods. Therefore, this comparative study used experimental and nonexperimental data to examine bias reduction, case retention, and covariate balance in the clustering method, PS subclassification, and PS weighting. In general, results suggest that the cluster-based methods reduced at least as much bias as the PS methods. Under certain conditions, the PS methods reduced more bias than the cluster-based method, and under other conditions the cluster-based methods were more advantageous. Although all methods were equally effective in retaining cases and balancing covariates, other data-specific conditions may likely favor the use of a cluster-based approach.     

Vagal Regulation of Heart Rate in the Prediction of Developmental Outcome for Very Low Birth Weight Preterm Infants

To Investigate heart rate and respiratory sinus arrhythmia (RSA) as markers of developmental outcome, infant ECG and 3 year outcome were assessed in 41 very low birth weight (<1,500 g) infants. Measures of mean hart rate and RSA, and the maturational shifts in their values from 33 to 35 weeks gestational age, were recorded. RSA measures predicted 3 year outcome beyond the effects of birth weight, medical risk, and socio-economic status. Higher RSA was associated with better social skills, whereas greater RSA maturation was associated with better mental processing and gross motor skills. Lower heat rate was associated with better behavior regulation and social skills, whereas greater maturational decreases were associated with better gross motor skills. Dividing the sample into groups of infants with birth weight less than 1,000 g and these with birth weight over 1,000 g, RSE maturation emerged a strong predictor of mental processing, knowledge base and gross motor skills in the former. A measured of joint maturation of RSA and heart rate was associated with better behavior regulation at 3 years, as measured by Child Behavior Checklist and parenting Stress Index scores, for this group. The findings directly respond to the need for physiological variables in the prediction of outcome in high-risk infants.     

Seek and You Shall Find? An Observational Study of Music Students' Library Catalog Search Behavior

This observational study examined the strategies that music students used to locate scores and media items in an academic library's online public access catalog (OPAC). During a usability test, investigators tracked students' search strategies and behaviors, and measured their success in identifying appropriate items. Students experienced briefer, less complicated, and more successful queries for media items than for music scores (the latter of which they struggled to find and properly identify). Class standing, library catalog experience, and prior library instruction had no significant effect on positive outcomes. Searches for music scores were highly sensitive to variations in query wording, and students frequently struggled to revise their searches.     

Role of the Information Professional in the Development and Promotion of Digital Humanities Content for Research,Teaching, and Learning in the Modern Academic Library: An Irish Case Study

ABSTRACT

The Internet has been the catalyst for the convergence of many subject areas and online platforms. Information professionals such as Archivists, IT developers and especially Librarians have been impacted in the development and promotion of digital humanities content for research, teaching, and learning in the modern academic library. In this case study, relevant findings from research that sought to determine the level of awareness of digital humanities in Irish Libraries is examined. The research project, The Mary Martin Diary, is highlighted as an example of a multidisciplinary collaboration project that utilized library communication skills, project management skills, digital humanities tools and techniques, as well as other online resources in its development. These skills and tools have the potential to be applied to similar projects that librarians engage in. Recommendations derived from this research highlight the practical application of skills for information professionals and their roles in the development and promotion of digital humanities content for research, teaching, and learning in the modern academic library.     

The effect of prior practice on memory reactivation and generalization

Three experiments examined the effect of practice on memory performance by 18-month-old infants. Infants were tested using an imitation paradigm; an adult demonstrated a series of actions with objects and infants were given the opportunity to reproduce those actions following a delay. Some infants practiced the target actions before the retention interval (practice) and some did not (no practice). In Experiment 1, a reminder treatment alleviated forgetting by infants who practiced but failed to alleviate forgetting by infants who did not practice. In Experiments 2A and 2B, infants who practiced generalized to novel test stimuli after a 24-hr delay, whereas infants without practice did not. Results suggest practice influences the accessibility and generality of infants' memories.     

Identification of social-emotional problems in young children using a parent-completed screening measure

The early identification of social and emotional problems in infants, toddlers, and young children is critical for improving developmental outcomes. The Ages and Stages Questionnaires: Social-Emotional, a newly-developed screening tool, is described in this article. Questionnaires span the 3- to 63-month period with 8 separate assessment intervals. Research findings, including data on 3014 questionnaires, are reported. Internal consistency was generally high, with an overall alpha of 0.82. Test-retest reliability between parents’ classifications was 0.94. Sensitivity ranged from 0.75 to 0.89 with 0.82 overall sensitivity; specificity ranged from 0.82 to 0.96 with 0.92 overall specificity. Parents reported easy understanding and high satisfaction with the questionnaires.     

Factors that contribute to child maltreatment severity: a multi-method and multidimensional investigation

OBJECTIVES: This study used data gathered during evaluations conducted by the Comprehensive Assessment and Training Services (CATS) Project to determine the relative contribution of four primary domains (demographic, adult characteristics, child characteristics, relational characteristics) to variation in the severity of child maltreatment, and to facilitate the development of empirically-based risk assessment tools. METHODS: A multidimensional, multi-method approach to data collection was used to assess 208 maltreating parents. Hierarchical multiple regression analyses were performed by entering each domain of variables into the regression equation in four consecutive blocks. RESULTS: The results of this study suggest that maltreatment severity varies as a function of the level of trauma recovery, substance misuse, a child's externalizing behavior, and qualitative features of the parent-child relationship, as well as the level of family stress. Relationship variables added to the amount of variance accounted for in the overall model, beyond demographic, adult, and child variables. CONCLUSIONS:: The findings of this study call attention to the importance of developing a multidimensional assessment model of the factors leading to child maltreatment severity and to broadening the parameters of assessment models used in child maltreatment research. The role that each of the contributing factors plays in the interference of effective parenting is also discussed.