Instrumental variable methods are a third analytic approach that estimate the effect of an intervention in observational data without requiring the factors that differ between the intervention groups ...

Statisticians point out that medical and other observational studies often produce results that are later shown to be incorrect. They now suggest ways to fix the system. S. Stanley Young, assistant ...

In their recent article in Journal of Clinical Oncology, Soni et al 1 compared findings from randomized controlled trials (RCTs) in oncology with analogous observational comparative effectiveness ...

First, satellites in the mega constellation are categorized and the constellation design based on different satellite division is proposed. Satellites in the mega constellation are divided into 2 ...

This is a preview. Log in through your library . Abstract A procedure is described for observation and enumeration of microscopic epilithic algae, directly on stone surfaces. The method involves the ...

Journal of Research in Music Education, Vol. 43, No. 2 (Summer, 1995), pp. 127-138 (12 pages) The purpose of this study was to determine the effects of competency-based self-analysis of videotape ...