Simplicial depth

Simplicial depth with respect to the six red sample points, using the modified definition of Burr et al. The large black numbers are the depths within each region, and the small blue numbers are the depths along the blue line segments.

In robust statistics and computational geometry, simplicial depth is a measure of central tendency determined by the simplices that contain a given point. For the Euclidean plane, it counts the number of triangles of sample points that contain a given point.