What is Cluster Analysis? Cluster a collection of data objects similar(or related) to one another within the same group dissimilar (or unrelated) to the objects in other groups Cluster analysis (or clustering, data segmentation, .. Finding similarities between data according to the characteristics found in the data and grouping similar data objects into clusters Unsupervised learning: no predefined classes(i.e, learning by observations Vs learning by examples: supervised Typical applications As a stand-alone tool to get insight into data distribution As a preprocessing step for other algorithms3 What is Cluster Analysis? ◼ Cluster: A collection of data objects ◼ similar (or related) to one another within the same group ◼ dissimilar (or unrelated) to the objects in other groups ◼ Cluster analysis (or clustering, data segmentation, …) ◼ Finding similarities between data according to the characteristics found in the data and grouping similar data objects into clusters ◼ Unsupervised learning: no predefined classes (i.e., learning by observations vs. learning by examples: supervised) ◼ Typical applications ◼ As a stand-alone tool to get insight into data distribution ◼ As a preprocessing step for other algorithms