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Had a looser caliper that resulted in biased matches been used, the resulting estimate would have been a biased estimate for the effect of exposure in the treated subjects, and there would be no way of knowing whether there was a population in which that was the true effect, much less of identifying such a population.
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CTree uses a neighbor biased matching algorithm to filter database networks.
We report the results for CTree for only the neighbor biased matching as it performs better than the other alternative.
The CTree method describes two variations for filtering the internal nodes of the tree, namely maximum weighted bipartite matching and neighbor biased matching.
If there is selection bias, matching estimators are not robust (Rosenbaum 2002).
If there is a hidden bias, matching estimators are not robust (Rosenbaum 2002).
To prevent bias, matching placebo tablets, which were identical in appearance, taste, and odor, were used.
To reduce the effect of treatment-selection bias, matched pairs of ORC and OAH patients were created using a propensity score matching (PSM) approach.
The protein was exogenously expressed, with the expression level chosen such that the population-averaged tumble bias matched that of wild-type cells ('Materials and methods').
To prevent classification and observer bias, matching of ED visits was completed with the investigator (LO) blinded to the ED diagnosis and visit details.
Any hits were not over-represented and not positionally biased, including potential matches to the TATA box, and are therefore unlikely to be authentic.
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