Before revision:  The data obtained are processed using both a statistical technique , Multiple Factor Analysis , and two geometric techniques, the recently appeared  method SensoGraph using Gabriel clustering, and a novel variant introduced here which is based on the pairwise distances between samples.
After revision:  The data obtained are processed using both a statistical technique , Multiple Factor Analysis , and two geometric techniques, the recently appeared method SensoGraph using Gabriel clustering, and the novel variant introduced here which is based on the pairwise distances between samples.