Résumé en anglais

What is the informational structure of the repeat-sales index? In this article we answer it, deconstructing the global index in its building blocks. As by-products of this reformulation we establish very simple and intuitive formulas for the volatility of the index and the reversibility phenomenon. We study the formal link between the repeat-sales index and the price indexes (median, hedonic…). We introduce a methodology of data analysis that improves greatly the extraction of the information embedded in a dataset. At last, we give some elements for a more general theory of the informational repeat-sales indexes.