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en:classification [2019/03/19 00:23]
David Zelený [Unsupervised vs supervised classification]
en:classification [2019/03/19 08:27] (current)
David Zelený [Types of classification methods]
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 ===== Types of classification methods ===== ===== Types of classification methods =====
  
-Simple “classification” of the numerical classification methods is in <imgref classif-classif>​. The methods are either **hierarchical** or **non-hierarchical**,​ depending on whether the resulting groups of samples have a hierarchical relationship (some are more similar than others, which can be displayed by dendrogram) or not. In case of hierarchical methods, two alternatives exist: **divisive** algorithms, which take the whole dataset and cut it into subsets and these subsets into smaller subsets, and **agglomerative** algorithms, which start from the level of individual samples and merge them together into larger groups ​a  little bit like a snowball.+Simple “classification” of the numerical classification methods is in <imgref classif-classif>​. The methods are either **hierarchical** or **non-hierarchical**,​ depending on whether the resulting groups of samples have a hierarchical relationship (some are more similar than others, which can be displayed by dendrogram) or not. In case of hierarchical methods, two alternatives exist: **divisive** algorithms, which take the whole dataset and cut it into subsets and these subsets into smaller subsets ​(in top-down direction), and **agglomerative** algorithms, which start from the level of individual samples and merge them together into larger groups ​(bottom-up direction).
  
-<​imgcaption classif-classif|Classification of classification methods. The dendrograms beside the panels indicate whether the clusters (groups) are hierarchically or non-hierarchically related. The dashed arrow in the case of hierarchical methods indicates the direction of clustering – from higher to lower hierarchy in case of divisive algorithms and from lower to higher hierarchies in the case of agglomerative algorithms. >​{{:​obrazky:​classification-of-classifications.jpg?​direct|}}</​imgcaption>​+<​imgcaption classif-classif|Classification of classification methods. The dendrograms beside the panels indicate whether the clusters (groups) are hierarchically or non-hierarchically related. The dashed arrow in the case of hierarchical methods indicates the direction of clustering – from higher to lower hierarchy in case of divisive algorithms ​(top-down direction) ​and from lower to higher hierarchies in the case of agglomerative algorithms ​(bottom-up direction). >​{{:​obrazky:​classification-of-classifications.jpg?​direct|}}</​imgcaption>​
  
    
en/classification.txt · Last modified: 2019/03/19 08:27 by David Zelený