A trial judge's finding of negligence will be set aside where the critical findings are based on unwarranted speculation rather than legitimate inference from established facts, even in medical negligence cases where the mechanism of injury is difficult to prove. Where critical findings are based on inference rather than credibility assessments, an appellate court is not constrained by the trial judge's advantage in seeing and hearing witnesses, and a new trial will not be ordered if the evidence could not support the findings.
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