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 ...

All the nurses asked were willing to be observed. A total of 6067 opportunities for error, 95 U-MAEs, and 162 O-MAEs were identified (Table 1). There were no significant differences in U-MAE rates, ...

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 ...

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 ...