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# Statistics::CalinskiHarabasz 0.01

Date Added: March 23, 2010  |  Visits: 635
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Statistics::CalinskiHarabasz is a Perl extension to the cluster stopping rule proposed by Calinski and Harabasz (C&H). SYNOPSIS use Statistics::CalinskiHarabasz; &ch(InputFile, "agglo", 10); Input file is expected in the "dense" format - Sample Input file: 6 5 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 1 0 0 1 1 0 0 0 1 1 1 0 0 1 C&H use the Variance Ratio Criterion which is analogous to F-Statistics to estimate the number of clusters a given data naturally falls into. They minimize Within Cluster/Group Sum of Squares (WGSS) and maximize Between Cluster/Group Sum of Squares (BGSS) EXPORT "ch" function by default. INPUT InputFile The input dataset is expected in "dense" matrix format. The input dense matrix is expected in a plain text file where the first line in the file gives the dimensions of the dataset and then the dataset in a matrix format should follow. The contexts / observations should be along the rows and the features should be along the column. eg: 6 5 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 1 0 0 1 1 0 0 0 1 1 1 0 0 1 The first line (6 5) gives the number of rows (observations) and the number of columns (features) present in the following matrix. Following each line records the frequency of occurrence of the feature at the column in the given observation. Thus features1 (1st column) occurs once in the observation1 and infact once in all the other observations too while the feature3 does not occur in observation1. ClusteringMethod The Clustering Measures that can be used are: 1. rb - Repeated Bisections [Default] 2. rbr - Repeated Bisections for by k-way refinement 3. direct - Direct k-way clustering 4. agglo - Agglomerative clustering 5. graph - Graph partitioning-based clustering 6. bagglo - Partitional biased Agglomerative clustering K value This is an approximate upper bound for the number of clusters that may be present in the dataset. Thus for a dataset that you expect to be seperated into 3 clusters this value should be set some integer value greater than 3. OUTPUT A single integer number which is the estimate of number of clusters present in the input dataset..

 Requirements: No special requirements Platforms: Linux Keyword: C H,  Calinskiharabasz,  Clustering,  Dataset,  Input,  Number,  Stopping Rule Users rating: 0/10

 License: Freeware Size: 6.14 KB
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