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Module 4: Cluster Analysis

20232m

CLARANS stands for

(i) Clustering Large Application based on RANdomized Search
(ii) Clustering Least Application based on RANdomized Sorting
(iii) Clustering Labelled Application based on RANdomized Search
(iv) None of the above

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Answer: (i) Clustering Large Application based on RANdomized Search

CLARANS is a medoid-based clustering algorithm for large datasets. Instead of exhaustively scanning all neighbours of a medoid (as PAM does) or drawing random samples once (as CLARA does), it searches the neighbourhood graph of potential medoid sets using a randomised search, jumping to a random neighbour each time a better one is found. The name is the direct expansion of that idea: CLustering Large Applications based on RANdomized Search.

Options (ii) and (iii) substitute incorrect words — 'Least ... Sorting' and 'Labelled ... Search' — neither of which belongs to the actual acronym. Because a correct expansion is given, 'None of the above' is also wrong.

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