Assertion: natural experiment | /r/HasProperty | observational studies
Facets:
Source sentences:
text: Thus, natural experiments are observational studies and are not controlled in the traditional sense of a randomized experiment.
text: Natural experiment , observational study in which an event or a situation that allows for the random or seemingly random assignment of study subjects to different groups is exploited to answer a particular question.
text: Thus, natural experiments are observational studies and are not controlled in the traditional sense of a randomized experiment.