The S&P/Case-Shiller Home Price Indices measures the residential housing market, tracking changes in the value of the residential real estate market in 20 metropolitan regions across the United States.These indices use the repeat sales pricing technique to measure housing markets. First developed by Karl Case and Robert Shiller, this methodology collects data on single-family home re-sales, capturing re-sold sale prices to form. sale pairs. This index family consists of 20 regional indices and two composite indices as aggregates of the regions S&P/Case-Shiller.

房价指数用来衡量住房市场，在全美的20个大城市追踪不动产市场变化。这一指数使用重复的销售价格技术来衡量住房市场。这一指数最初是由Karl Case and Robert Shiller研究的，这个方法收集单一家庭住房的买入卖出数据。这个指数系列包括20个地区指数和由地区指数加和而成的两个复合指数。[@more@]The S&P/Case-Shiller Home Price Indices are calculated monthly and published with a two month lag. New index levels are released at 9am Eastern Standard Time on the last Tuesday of every month.

房价指数每月计算，每两个月发布一次。新指数会在美东时间每个月周二的9AM发布。

More: http://en.wikipedia.org/wiki/Case-Shiller_index