Where a trial judge chooses between competing expert opinions and one expert's reliability has been pointedly attacked in cross-examination, the judge must explain the choice and cannot rely on an Abalos inference that the preferred expert was implicitly found more credible. The conflict of expert evidence may be too important to be left unexplained. Where a trial judge has not passed upon a plaintiff's credibility, an appellate court cannot fill that gap on the basis of the transcript alone, and a new trial must be ordered.
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