This example dataset is retreived from the online supplement to Eisen et al. (1998), which is a very well known paper about cluster analysis and visualization. The details of how the data was collected are outlined in the paper.

In a cluster heat map, magnitudes are laid out into a matrix of fixed cell size whose rows and columns are discrete phenomena and categories, and the sorting of rows and columns is intentional and somewhat arbitrary, with the goal of suggesting clusters or portraying them as discovered via statistical analysis.

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And then we churn it through a machine that is the cluster analysis, and then out comes an assignment that maps each point to a particular cluster. So on the bottom here, X1 is mapped to Cluster 1, X2 is mapped to Cluster 2, and there are a lot of different algorithms that exist to detect clusters.

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Cluster Analysis 1: finding groups in a randomly generated 2-dimensional dataset Examples based on a random data set (see example code below), illustrating some of the differences between the K-means and C-means clustering methods as implemented in R.

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In multivariate analysis, cluster analysis refers to methods used to divide up objects into similar groups, or, more precisely, groups whose members are all close to one another on various dimensions being measured.