The S&P Case-Shiller Home Price Index tracks changes in the value of residential real estate in 20 metropolitan regions across the U.S. each month.
The composite indexes and the regional indexes are seen by the markets as measuring changes in existing home prices and are based on single-family home re-sales.
The key composite series tracked are for the expanded 20-city composite indexes. The original series only covered 10 cities.
The indexes are based on single-family dwellings with two or more sales transactions. Condominiums and co-ops are excluded as is new construction. The latest data are reported with a two-month lag.
Data through April 2012, released today by S&P Indices for its S&P/Case-Shiller Home Price Indices, the leading measure of U.S. home prices, showed that on average home prices increased 1.3% in the month of April for both the 10- and 20-City Composites.