Beginning Data Science in R by Thomas Mailund

Author:Thomas Mailund
Language: eng
Format: epub, pdf
Publisher: Apress, Berkeley, CA

These are simply vectors of the same form as the input data points. They are the center of mass for each of the three clusters we have computed.

The cluster assignment is simply an integer vector with a number for each data point specifying which cluster that data point is assigned to:

clusters$cluster %>% head

## [1] 1 1 1 1 1 1

clusters$cluster %>% table

## .

## 1 2 3

## 50 38 62

There are 50 data points for each species so if the clustering perfectly matched the species we should see 50 points for each cluster as well. The clustering is not perfect, but we can try plotting the data and see how well the clustering matches the species class.

We can first plot how many data points from each species are assigned to each cluster (see Figure 7-9).

Figure 7-9.Cluster assignments for the three iris species

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