ClustGeo: an R package for hierarchical clustering with spatial constraints

Marie Chavent (1, 2) , Vanessa Kuentz-Simonet (3) , Amaury Labenne (3) , Jérôme Saracco (1, 2, 4)

1 IMB - Institut de Mathématiques de Bordeaux
2 CQFD - Quality control and dynamic reliability
3 UR ETBX - Environnement, territoires et infrastructures
4 ENSC - Ecole Nationale Supérieure de Cognitique

In this paper, we propose a Ward-like hierarchical clustering algorithm including spatial/geographical constraints. Two dissimilarity matrices $D_0$ and $D_1$ are inputted, along with a mixing parameter $\alpha \in [0,1]$. The dissimilarities can be non-Euclidean and the weights of the observations can be non-uniform. The first matrix gives the dissimilarities in the "feature space" and the second matrix gives the dissimilarities in the "constraint space". The criterion minimized at each stage is a convex combination of the homogeneity criterion calculated with $D_0$ and the homogeneity criterion calculated with $D_1$. The idea is then to determine a value of $\alpha$ which increases the spatial contiguity without deteriorating too much the quality of the solution based on the variables of interest i.e. those of the feature space. This procedure is illustrated on a real dataset using the R package ClustGeo.

Domaines: Calcul [stat.CO]; Autres [stat.ML]

Marie Chavent, Vanessa Kuentz-Simonet, Amaury Labenne, Jérôme Saracco. ClustGeo: an R package for hierarchical clustering with spatial constraints. Computational Statistics, 2018, 33 (4), pp.1-24. ⟨10.1007/s00180-018-0791-1⟩. ⟨hal-01664018⟩