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 ...

This article was originally published on Built In by Eric Kleppen. Variance is a powerful statistic used in data analysis and machine learning. It is one of the four main measures of variability along ...