The Standard & Poor’s Case–Shiller Home Price Indices are repeat-sales house price indices for the United States. There are multiple Case–Shiller home price indices: A national home price index, a 20-city composite index, a 10-city composite index, and twenty individual metro area indices. These indices are calculated and kept monthly by Standard and Poor, with data points calculated for the time period of January 1987 through the present. The indices kept by Standard and Poor are normalized to have a value of 100 in January 2000. These Indices are based on original work by economists Karl Case and Robert Shiller, in which their team calculated the home price index back to 1890. That index is normalized to have 1890 have a value of 100. The Case–Shiller Index being kept on Robert Shillers website (http://www.econ.yale.edu/~shiller/data.htm) is updated quarterly. Due to the different set reference points, and perhaps calculation differences, the index numbers provided in each data set can be very different. For example, in 4th quarter 2013, the Standard and Poor 20 city index point was in the 160’s, while the index point for 4th quarter on the Shiller data was in the 130’s. Professor Robert Shiller claims in his book Irrational Exuberance that such a long series of home prices does not appear to have been published for any country.