October 2017
Beginner to intermediate
572 pages
26h 1m
English
book
Machine Learning with R Cookbook - Second Edition
by AshishSingh Bhatia, Yu-Wei, Chiu (David Chiu)
Content preview from Machine Learning with R Cookbook - Second Edition
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How it works...
We can determine the number of clusters from the dendrogram in the preceding figure. In this recipe, we determine that there should be four clusters within the tree. Therefore, we specify the number of clusters as 4 in the cutree function. Besides using the number of clusters to cut the tree, you can specify the height as the cut tree parameter.
Next, we can output the cluster labels of the data and use the table function to count the amount of data within each cluster. From the counting table, we find that most of the data is in cluster 4. Lastly, we can draw red rectangles around the clusters to show how data is categorized into the four clusters with the rect.hclust function.
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.