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Definitions for cluster sampling. Cluster sampling. Cluster sampling is a sampling technique used when natural but relatively homogeneous groupings are evident in a statistical population. It is often used in marketing research.
Clustering is the process of partitioning a group of data points into a small number of clusters. For instance, the items in a supermarket are clustered in categories (butter, cheese and milk are grouped in dairy products). Of course this is a qualitative kind of partitioning.n empirical way to find the best number of clusters is to try K-means clustering with different number of clusters and measure the resulting sum of squares. The most curious can look at this paper for a benchmarking of 30 procedures for estimating the number of clusters.