bn:03475905n
Noun Concept
EL
Μελέτη βασιζόμενη στην παρατήρηση  μελέτες παρατήρησης  μελέτη παρατήρησης
EN
In fields such as epidemiology, social sciences, psychology and statistics, an observational study draws inferences from a sample to a population where the independent variable is not under the control of the researcher because of ethical concerns or logistical constraints. Wikipedia
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