Assertion: natural experiment | /r/HasProperty | defined and large change
Facets:
value: in the treatment
type: OTHER
value: to a clearly defined subpopulation
type: TRANSITIVE-OBJECT
value: clearly
type: MANNER
Source sentences:
text: Natural experiments are most useful when there has been a clearly defined and large change in the treatment to a clearly defined subpopulation, so that changes in responses may be plausibly attributed to the change in treatments.