Data Fusion for Analysis of Persistence in Pervasive Actimetry of Elderly People at Home, and the Notion of Biological Age

If we watch elderly people at home for health or security purposes, we need a reliable pervasive information from a domestic network of localizing sensors allowing to follow the different locations at which the dependent persons can be detected. The data recorded can be treated as the sequence of color coded numbers of balls (symbolizing rooms) taken in a Polya´s urn, in which the persistence of the presence in a room is taken into account by adding a certain number of balls of the same color as the ball just drawn. We discuss the pertinency of such a procedure to early detect sudden or chronic changes in the parameters values of the random process made of the succession of ball numbers and we use it to trigger alarms, whose level depends on the real biological age of the elderly people watched at home.