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.
Observational Studies
Cena regularna
1.175,00 zł
Cena sprzedaży
1.175,00 zł
Cena regularna
1.213,00 zł
Cena jednostkowa/ za
Wybranie zaznaczenia powoduje odświeżenie całej strony.
