Εstimate and return the necessary parameters for cluster analysis visualizations, used in OpenBudgets.eu. It involves a set of techniques and algorithms used to find and divide into groups the Budget data of municipalities across Europe, described by the OpenBudgets.eu data model. The available clustering algorithms are hierarchical, kmeans from R base, pam, clara, fuzzy from cluster package and model based algorithms from mclust package. It can be used to find the appropriate clustering algorithm and/or the appropriate clustering number of the input data according to the internal and stability measures from clValid package. This package can generally be used to estimate clustering parameters, extract and convert them to JSON format and use them as input in a different graphical interface and also can be used in data that are not described by the OpenBudgets.eu data model. You can see detailed information here.