What are observational studies?

Some articles on observational studies, studies, observational:

Hyperbaric Medicine - Clinical Evidence - Neuro-rehabilitation
... brain injury identified 2 randomized controlled trials and 5 observational studies that met evaluated functional health outcomes ... The studies ranged from fair to poor in quality ... The observational studies were weak in quality and did not provide enough evidence of clinical improvement following HBOT treatment ...
Propensity Score Matching
... In the statistical analysis of observational data, propensity score matching (PSM) is a statistical matching technique that attempts to estimate the effect of a treatment, policy, or other intervention by ... published by Paul Rosenbaum and Donald Rubin in 1983, and implements the Rubin causal model for observational studies ... Unfortunately, for observational studies, the assignment of treatments to research subjects is, by definition, not randomized ...
Clinical Trial - Design
... distinction in evidence-based medicine is between observational studies and randomized controlled trials ... Types of observational studies in epidemiology, such as the cohort study and the case-control study, provide less compelling evidence than the randomized controlled trial ... In observational studies, the investigators only observe associations (correlations) between the treatments experienced by participants and their health ...

Famous quotes containing the word studies:

    Recent studies that have investigated maternal satisfaction have found this to be a better prediction of mother-child interaction than work status alone. More important for the overall quality of interaction with their children than simply whether the mother works or not, these studies suggest, is how satisfied the mother is with her role as worker or homemaker. Satisfied women are consistently more warm, involved, playful, stimulating and effective with their children than unsatisfied women.
    Alison Clarke-Stewart (20th century)