An evolutionary approach to performing hard partitional clustering. The algorithm uses genetic operators guided by information about the quality of individual partitions. The method looks for the best barycenters/centroids configuration (encoded as real-value) to maximize or minimize one of the given clustering validation criteria: Silhouette, Dunn Index, C-Index or Calinski-Harabasz Index. As many other clustering algorithms, 'gama' asks for k: a fixed a priori established number of partitions. If the user does not know the best value for k, the algorithm estimates it by using one of two user-specified options: minimum or broad. The first method uses an approximation of the second derivative of a set of points to automatically detect the maximum curvature (the 'elbow') in the within-cluster sum of squares error (WCSSE) graph. The second method estimates the best k value through majority voting of 24 indices. One of the major advantages of 'gama' is to introduce a bias to detect partitions which attend a particular criterion. References: Scrucca, L. (2013) <doi:10.18637/jss.v053.i04>; CHARRAD, Malika et al. (2014) <doi:10.18637/jss.v061.i06>; Tsagris M, Papadakis M. (2018) <doi:10.7287/peerj.preprints.26605v1>; Kaufman, L., & Rousseeuw, P. (1990, ISBN:0-47 1-73578-7).

Version: | 1.0.3 |

Imports: | ArgumentCheck, cluster, clusterCrit, NbClust, GA, ggplot2, methods, Rfast |

Suggests: | knitr, rmarkdown |

Published: | 2019-02-26 |

Author: | Jairson Rodrigues [aut, cre], Germano Vasconcelos [aut, ths], Renato Tin'{o}s [aut, rev] |

Maintainer: | Jairson Rodrigues <jairson.rodrigues at univasf.edu.br> |

License: | GPL-2 | GPL-3 [expanded from: GPL (≥ 2)] |

URL: | https://github.com/jairsonrodrigues/gama |

NeedsCompilation: | no |

Materials: | README NEWS |

CRAN checks: | gama results |

Reference manual: | gama.pdf |

Vignettes: |
Using gama - a Genetic Approach to Maximize clustering criterion |

Package source: | gama_1.0.3.tar.gz |

Windows binaries: | r-devel: gama_1.0.3.zip, r-devel-gcc8: gama_1.0.3.zip, r-release: gama_1.0.3.zip, r-oldrel: gama_1.0.3.zip |

OS X binaries: | r-release: gama_1.0.3.tgz, r-oldrel: gama_1.0.3.tgz |

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