High Quality Content by WIKIPEDIA articles! A true experiment is a method of social research in which there are two kinds of variables. The signifying characteristic of a true experiment is that it randomly allocates the subjects in order to neutralize the potential for experimenter bias. A natural or Quasi-experiment is a naturally occurring instance of an observable phenomena which approximate or duplicate the properties of a controlled experiment. In contrast to laboratory experiments, these events aren't created by scientists, but yield data which nonetheless can be used (commonly through the use of instrumental variables) to make causal inferences. Natural experiments are a common research tool in fields where artificial experimentation is difficult, such as economics, cosmology, epidemiology, and sociology.

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