Social Explorer; Federal Housing Finance Agency House Price Index (HPI).
House Price Index Technical Documentation
24. How are the monthly HPIs calculated?
The monthly indexes are calculated in the same way the quarterly indexes are constructed, except transactions from the same quarter are no longer aggregated. To construct the quarterly index, all transactions from the same quarter are aggregated and index values are estimated using the assigned quarters. In the monthly indexing model, all transactions for the same month are aggregated and separate index values are estimated for each month.