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Module 4: Cluster Analysis

20202m

Cluster is

(i) group of similar objects that differ significantly from other objects
(ii) operations on a database to transform or simplify data in order to prepare it for a machine learning algorithm
(iii) symbolic representation of facts or ideas from which information can potentially be extracted
(iv) None of the above

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Answer: (i) group of similar objects that differ significantly from other objects

In data mining, a cluster is a collection of data objects that are similar to one another within the same cluster and dissimilar to the objects in other clusters. This is the standard textbook definition (Han & Kamber).

Why the others are wrong:

  • (ii) describes data transformation/preprocessing (preparing data for a learning algorithm), not a cluster.
  • (iii) describes data/information (a symbolic representation from which information can be extracted), not a cluster.
  • (iv) None of the above — incorrect since (i) is the correct definition.

Hence a cluster is a group of similar objects that differ significantly from other objects — option (i).

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