The HPI is a broad measure of the movement of single-family house
prices. The HPI is a weighted, repeat-sales index, meaning that it
measures average price changes in repeat sales or refinancings on the
same properties. This information is obtained by reviewing repeat
mortgage transactions on single-family properties whose mortgages have
been purchased or securitized by Fannie Mae or Freddie Mac since January
Because of the breadth of the sample, it provides more information than is available in other house price indexes.
Information provided by www.fhfa.gov. For more information, visit www.fhfa.gov.