Database-Management-System

Question 506

A clustering technique that permits a convenient graphical display is :

A	partition based clustering
B	probabilistic model based clustering
C	hierarchical clustering
D	agglomerative clustering

Database-Management-Systemdata-miningUGC NET CS 2009-June-Paper-2

Question 506 Explanation:

→ Hierarchical methods of cluster analysis permit a convenient graphical display in which the entire sequence of merging(or splitting) because of its tree like nature, the display has the name of dendrogram.
Types:
1. Agglomerative: This is a “bottom-up” approach: each observation starts in its own cluster, and pairs of clusters are merged as one moves up the hierarchy.
2. Divisive: This is a “top-down” approach: all observations start in one cluster, and splits are performed recursively as one moves down the hierarchy.

Correct Answer: C

Question 506 Explanation:

→ Hierarchical methods of cluster analysis permit a convenient graphical display in which the entire sequence of merging(or splitting) because of its tree like nature, the display has the name of dendrogram.
Types:
1. Agglomerative: This is a “bottom-up” approach: each observation starts in its own cluster, and pairs of clusters are merged as one moves up the hierarchy.
2. Divisive: This is a “top-down” approach: all observations start in one cluster, and splits are performed recursively as one moves down the hierarchy.