Proximity measure To assign a point to the closest centroid we need a proximity measure that quantifies the notion of "closest Euclidean (L2) distance is often used for data point in Euclidean space. 8/20/2016 PATTERN RECOGNITIONProximity measure To assign a point to the closest centroid, we need a proximity measure that quantifies the notion of “closest”. Euclidean (L2 ) distance is often used for data point in Euclidean space. 8/20/2016 PATTERN RECOGNITION 20