We find significant correlations between asymmetry and the depressive state assessed in the older individual. Then, we introduce the notion of asymmetry that synthesizes these activities. The results show the existence of three clusters of phone call activity named (1) proactive, (2) interactive, and (3) r eactive. We then evaluate its added-value for depression assessment regarding the Geriatric Depression Scale score assessed within our population during the study. In the present work, we specifically investigate, in a 26-older-adults population over 12 months, whether and how this parameter could be used in CDRs analysis. Particularly, no clear consensus exists in the use of the direction parameter characterizing the directed nature of interactions in CDRs. However, deeper investigations are required to confirm its relevance in social interaction modeling. Analyzing social interactions on a passive and non-invasive way through the use of phone call detail records (CDRs) is now recognized as a promising approach in health monitoring.
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