In general, what's the first and most important thing to check before agreeing that a certain set of data should be treated as a quasi-experiment?

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In general, what's the first and most important thing to check before agreeing that a certain set of data should be treated as a quasi-experiment?



Answer: The most important question is whether the subject variable is really more stable than the data variable. This must be true for the set of data to be treated as a quasi-experiment.

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