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  • Book Overview & Buying Mastering Machine Learning with R
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Mastering Machine Learning with R

Mastering Machine Learning with R

By : Cory Lesmeister
4.3 (6)
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Mastering Machine Learning with R

Mastering Machine Learning with R

4.3 (6)
By: Cory Lesmeister

Overview of this book

Machine learning is a field of Artificial Intelligence to build systems that learn from data. Given the growing prominence of R—a cross-platform, zero-cost statistical programming environment—there has never been a better time to start applying machine learning to your data. The book starts with introduction to Cross-Industry Standard Process for Data Mining. It takes you through Multivariate Regression in detail. Moving on, you will also address Classification and Regression trees. You will learn a couple of “Unsupervised techniques”. Finally, the book will walk you through text analysis and time series. The book will deliver practical and real-world solutions to problems and variety of tasks such as complex recommendation systems. By the end of this book, you will gain expertise in performing R machine learning and will be able to build complex ML projects using R and its packages.
Table of Contents (15 chapters)
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14
Index

K-means clustering


With k-means, we will need to specify the exact number of clusters that we want. The algorithm will then iterate until each observation belongs to just one of the k-clusters. The algorithm's goal is to minimize the within-cluster variation as defined by the squared Euclidean distances. So, the kth-cluster variation is the sum of the squared Euclidean distances for all the pairwise observations divided by the number of observations in the cluster.

Due to the iteration process that is involved, one k-means result can differ greatly from another result even if you specify the same number of clusters. Let's see how this plays out for a situation where we will specify three clusters:

  1. Each observation is randomly assigned by the algorithm to one of the three clusters.

  2. Each cluster has a centroid calculated by the algorithm, which is a vector of the variable means for the observations. For example, if you have five input variables, your centroid would be a vector of five values...

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