The use of a statistical test with low power in medical research is skin to the use of a diagnostic test with low sensitivity in clinical practice: even when the treatment being evaluated is actually effective, the researcher working without adequate power is likely to find no evidenceof this… More

Meta-analysis is the process of developing a comprehensive picture of a field of research byperforming analyses on summary data from individual studies -- it allows us to synthesize a body ofevidence for the purpose of setting policy or planning future research. Meta-analysis has had asubstantial… More

DESCRIPTION (Applicant's abstract): The goal of this project is to develop software to address publication bias in meta analysis. The software will incorporate various computational approaches including procedures that focus on the presence of bias, others that yield an… More

DESCRIPTION (provided by applicant): Over the past decade, meta analysis has come to play a key role in setting policy and also in planning new research. In gerontology, recent meta analyses have led to treatment recommendations or new insights in such areas as memory loss with normal aging,… More

DESCRIPTION (Applicant's abstract): The goal of this project is to develop software to address publication bias in meta analysis. The software will incorporate various computational approaches including procedures that focus on the presence of bias, others that yield an… More

DESCRIPTION (provided by applicant): Over the past decade, meta analysis has come to play a key role in setting policy and also in planning new research. In gerontology, recent meta analyses have led to treatment recommendations or new insights in such areas as memory loss with normal aging,… More

DESCRIPTION (provided by applicant): Group sequential trials is the term used to describe clinical trials that take place over a period of time, with statistical analyses being conducted at various points over the course the trial. If it can be shown at an interim analysis that the treatment is… More

DESCRIPTION (provided by applicant): Meta analysis plays a key role in setting policy and in planning new research. In gerontology, meta analyses have led to treatment recommendations or new insights in such areas as memory loss with normal aging; identifying, predicting, and treating Alzheimer's… More

DESCRIPTION (provided by applicant): Meta analysis plays a key role in setting policy and in planning new research. In gerontology, meta analyses have led to treatment recommendations or new insights in such areas as memory loss with normal aging; identifying, predicting, and treating Alzheimer's… More

DESCRIPTION (provided by applicant): Meta analysis plays a key role in setting policy and in planning new research. In the field of substance abuse prevention, meta analyses have been used to determine the relative impact of competing treatments for addiction, to estimate prevalence of… More

DESCRIPTION (provided by applicant): Diagnostic tests are the tests that clinicians use to make a diagnosis, i.e., to determine whether or not a person has a particular disease. In gerontology, for example, an array of diagnostic tests have been developed to identify persons with Alzheimer's… More

Not avaiable.

DESCRIPTION (provided by applicant): Meta-analysis plays a key role in setting policy and in planning new research. In the field of substance abuse prevention, meta-analyses have been used to determine the relative impact of competing treatments for addict ion, to estimate prevalence of… More

DESCRIPTION (provided by applicant): Cluster randomized trials are trials in which intact units such as hospitals, clinics, or schools, are randomly assigned to a condition such as Treatment or Control. Cluster randomized trials play a prominent role in me dicine, health, and social policy research,… More

DESCRIPTION (provided by applicant): Meta-analysis is the statistical procedure employed to synthesize data from a series of studies. As such, it falls at the core of evidence-based policy in such fields as alcohol and substance abuse, medicine, social sci ence, ecology, education, gerontology,… More

DESCRIPTION (provided by applicant): Longitudinal trials are trials in which researchers track outcomes over a period of time. These trials play a prominent role in many fields including drug abuse, aging, medicine, social science, and education. Longitudi nal studies, by their nature, often address… More

Purpose: In education research, the standardized mean difference (symbolized by d) is the predominant effect size index. It is calculated as the difference between the treatment-group and control-group means, divided by the pooled standard deviation. Using d allows the impacts of education… More

DESCRIPTION (provided by applicant): Longitudinal trials are trials in which researchers track outcomes over a period of time. These trials play a prominent role in many fields including drug abuse, aging, medicine, social science, and education. Longitudinal studies, by their nature, often address… More

DESCRIPTION (provided by applicant): Meta-analysis is the statistical procedure employed to synthesize data from a series of studies. As such, it falls at the core of evidence-based policy in such fields as alcohol and substance abuse, medicine, social science, ecology, education, gerontology, among… More

Purpose: In education research, the standardized mean difference (symbolized by d) is the predominant effect size index. It is calculated as the difference between the treatment-group and control-group means, divided by the pooled standard deviation. Using d allows the impacts of education… More