Mediation effects of multiple mediators are determined by two associations: one between an exposure and mediators (S-M) and the other between the mediators and an outcome conditional on the exposure ...
It is a necessary condition that items and tests have variance and discrimination in the range of interest (population of observations) for which they are calibrated and selected. The basis for ...
Sept. 24 (UPI) --COVID-19 antibody test accuracy could be as low as 61%, depending on the type, and when and how they are used, according to an analysis published Thursday by the journal PLOS ...
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