Investopedia explains 'House Price Index - HPI'
The HPI is based on transactions involving conventional and conforming mortgages - only on single-family properties - that have been purchased or securitized by Fannie Mae or Freddie Mac. It is a weighted, repeat-sales index, which means that it measures average price changes in repeat sales or refinancings on the same properties. A comprehensive HPI report is published every quarter, while a monthly report has been published from March 2008.
The HPI differs from the well-known S&P/Case-Shiller Home Price Indexes in a number of ways. For example, while the Case-Shiller indexes only use purchase prices, the all-transactions HPI also includes refinance appraisals.
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