Social Explorer; Federal Housing Finance Agency House Price Index (HPI).
House Price Index Technical Documentation
28. Do you have an HPI that includes loans which are not purchased or securitized by Fannie Mae and Freddie Mac?
Yes, the expanded-data index includes purchase-money mortgages from other sources.
The approach to estimating the expanded-data HPI is detailed in the Highlights article published with the 2011Q2 HPI at http://go.usa.gov/8kNm. In general, the methodology is the same as is used in the construction of the standard purchase-only HPI, except a supplemented dataset is used for estimation. The augmented data include sales price information from Fannie Mae and Freddie Mac mortgages as well as two new information sources: (1) transactions records for houses with mortgages endorsed by FHA and (2) county recorder data licensed from CoreLogic. The licensed county recorder data do not include records in many U.S. counties-particularly rural ones. To ensure that the addition of the CoreLogic data to the estimation sample does not unduly bias index estimates toward price trends in urban areas, the expanded-data index for certain states is estimated by weighting price trends in areas with CoreLogic coverage and other areas. Details on this sub-area weighting can be found in the text of the Highlights piece referenced above.