Proximity measure The sse is defined as follows: K Sse ∑>xc2 1x∈C In this equation o x is a data object C: is the i-th cluster. c: is the centroid of cluster c d is the Euclidean (L,) distance between two objects in Euclidean space 8/20/2016 PATTERN RECOGNITIONProximity measure The SSE is defined as follows: 𝑆𝑆𝐸 = ෍ 𝑖=1 𝐾 ෍ 𝐱∈𝐶𝑖 𝑑 𝐱, 𝐜𝑖 2 In this equation ◦ x is a data object. ◦ Ci is the i-th cluster. ◦ ci is the centroid of cluster Ci . ◦ d is the Euclidean (L2 ) distance between two objects in Euclidean space. 8/20/2016 PATTERN RECOGNITION 23