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Cluster Analysis
 
Cluster Analysis

Ref : www.wikipedia.com, www.clustan.com

Cluster analysis is a class of statistical techniques that can be applied to data that exhibits "natural" groupings. Cluster analysis sorts through the raw data and groups them into clusters.
A cluster is a group of relatively homogeneous cases or observations. Objects in a cluster are similar to each other. They are also dissimilar to objects outside the cluster, particularly objects in other clusters.
Clustering is the classification of similar objects into different groups, or more precisely, the partitioning of a data set into subsets (clusters), so that the data in each subset (ideally) share some common trait - often proximity according to some defined distance measure.
The diagram below illustrates the results of a survey that studied drinkers' perceptions of spirits (alcohol). Each point represents the results from one respondent. The research indicates there are four clusters in this market.

Another example is the vacation travel market. Recent research has identified three clusters or market segments. They are the: 1) The demanders - they want exceptional service and expect to be pampered; 2) The escapists - they want to get away and just relax; 3) The educationalist - they want to see new things, go to museums, go on a safari, or experience new cultures.

In marketing, cluster analysis is used for:
?-Segmenting the market and determining target markets
?-Product positioning and New Product Development
?-Selecting test markets
The basic procedure
1. Formulate the problem - select the variables that you wish to apply the clustering technique to.
2. Select a distance measure - various ways of computing distance:
o Squared Eu ...
 
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