Monitoring private transactions in the housing market is much more difficult than the stock market because of the great heterogeneity across housing units. No housing unit is the same with another one, in tems of physical characteristics, design, materials, functionality equipment, location etc. Since all these differences have direct income on value it is difficult to have a price index. Averaging sales prices through time may be misleading as the quality mix of units sold each time period is different. A true price index for housing needs to control for this. In any case, if I undestand what are you looking for, you are referring to a constant-quality housing price index that shows movements in prices by location. Such a scientifically derived index is the one produced by the Office of Federal Housing Enterprise Oversight. Hope this helps.
Petros
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