Observational studies
Auteur :
Rosenbaum, Paul R.
Éditeur :
Springer-Verlag New York Inc.
ISBN :
9780387989679
Date de publication :
8 janv. 2002
Dimensions :
23,5 x 15,5 cm
Langue :
Anglais
Pays d'origine :
USA
An observational study is an empiric investigation of the effects caused by a treatment, policy, or intervention in which it is not possible to assign subjects at random to treatment or control, as would be done in a controlled experiment.