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Overmatching is matching for an apparent mediator that actually is a result of the exposure. If the mediator itself is stratified, an obscured relation of the exposure to the disease would highly be likely to be induced.
Overmatching is matching for an apparent mediator that actually is a result of the exposure. If the mediator itself is stratified, an obscured relation of the exposure to the disease would highly be likely to be induced.
过匹配是对表面是中介变量、实际上是暴露的结果进行匹配。如果中介变量本身是分层的，则很可能引致一种疾病与暴露的令人费解的关系。
It may be regarded as a [[sampling bias]] in decreasing the [[external validity]] of a study, because the controls become more similar to the cases in regard to exposure than the general population.
It may be regarded as a [[sampling bias]] in decreasing the [[external validity]] of a study, because the controls become more similar to the cases in regard to exposure than the general population.
It may be regarded as a sampling bias in decreasing the external validity of a study, because the controls become more similar to the cases in regard to exposure than the general population.
It may be regarded as a sampling bias in decreasing the external validity of a study, because the controls become more similar to the cases in regard to exposure than the general population.