Why, in general, are quasi-experiment not threatened (any more than "real" experiments) by the third- variable problem?

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Why, in general, are quasi-experiment not threatened (any more than "real" experiments) by the third- variable problem?



Answer: Like "real" experiments, the interpretation (and internal validity) of all quasi-experiments can be threatened by confounds. On the surface, it might appear that quasi-experiments are in serious trouble because no attempt was made to create equivalent groups. But when you think about it in terms of causation, instead of just confounding, you often find that all of the third variables that could be the real cause of both the subject variable and the data variable are actually aspects of the subject variable, itself.

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