Lecture Note
University
University of California San DiegoCourse
DSC 207R | Python for Data SciencePages
2
Academic year
2023
anon
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27
Clustering Machine Learning in Python: Clustering Do you want to look for trends in your data? Do you wish to combine data points that are similar? Cluster analysis may be the best technique for you if this is the case. Thefundamentals of cluster analysis, its operation, and how it might be applied to your data areall covered in this article. You will be able to define the purpose of cluster analysis by the endof this article, discuss whether cluster analysis is supervised or unsupervised, and describea few applications for cluster results. Understanding Cluster Analysis Cluster analysis is a technique used to group similar items in your data set into clusters. By segmenting your data into clusters, you can analyze each cluster more carefully. The goal ofcluster analysis is to segment data so that the differences between samples in the samecluster are minimized, while the differences between samples of different clusters aremaximized. Cluster analysis requires some sort of metric to measure similarity between two samples. Some common similarity measures are Euclidean distance, Manhattan distance, and cosinesimilarity. Since distance measures such as Euclidean distance are often used to measuresimilarity between samples in clustering algorithms, it may be necessary to normalize theinput variables so that no one value dominates the similarity calculation. Scaling and Normalizing Variables Two techniques for making variables comparable are scaling and normalizing them. Scaling with input variables essentially equalizes the scale of the variables, giving them allthe same weight in the calculation used to compare the similarity of samples. When youhave variables with widely disparate scales, like weight and height, scaling is important. Unsupervised Task Unlike classification and regression, cluster analysis is an unsupervised task. This means that there is no target label for any sample in the data set. In general, there is no correct
clustering results. The best set of clusters is highly dependent on the application and howthe resulting clusters will be used. Application of Cluster Analysis Several fields can benefit from the use of cluster analysis. Using cluster analysis to segment your consumer base based on past purchases is a frequent use for the technique.The following are further instances of cluster analysis: 1. Characterization of different weather patterns for a region2. Grouping the latest news articles into topics to identify the trending topics of the day3. Discovering hot spots for different types of crime from police reports in order to provide sufficient police presence for problem areas. Conclusion Cluster analysis is a powerful technique that can help you uncover patterns in your data. By segmenting your data into clusters, you can analyze each cluster more carefully and gaininsights that might not be apparent otherwise. While cluster analysis is an unsupervisedtask, there are many ways that the results can be applied in a variety of fields. So, if youwant to find patterns in your data and group similar data points together, then give clusteranalysis a try.
Cluster Analysis in Python
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