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The advantage of an experimental study over a descriptive one
is that the researcher has so much more control over the outcomes.
But even so if the patient’s participation is necessary (as in
taking medicines), then close observation of compliance is
necessary. Also, a complete follow up of all individuals is
necessary. And in addition, there may be a problem with people’s
willingness to be randomized to one treatment or the other with
the result that people opt out of the study and the study becomes
invalid if this is a severe problem.
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