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The propensity score is the probability of treatment assignment conditional on observed baseline characteristics. The propensity score allows one to design and analyze an observational (nonrandomized) study so that it mi...

Materias / palabras clave: Medicine; Public health; Scale (ratio); Epidemiology; Quality assessment; Environmental health; Quality (philosophy); Family medicine; External quality assessment; Internal medicine; Pathology; Epistemology

Presents a discussion of matching, randomization, random sampling, and other methods of controlling extraneous variation. The objective was to specify the benefits of randomization in estimating causal effects of treatme...

<b><i>Background and Objectives:</i></b> There is a substantial body of evidence assessing the effects of equine-assisted therapy on physiological and psychological aspects of individuals with dis...