27 Aug 2003
CS 6210: Module 3
25/31
Calculating
Similarity
¡Euclidean Distance -
bad
lM(Q,Dd)
= sqrt (Σ |wq,t – wd,t|2)
lDissimilarity Measure;
use reciprocal
lHas problem with long
documents, why?
¡Actually don’t care
about vector length, just their direction
lWant to measure
difference in direction