Case-Shiller Trashed by, Zillow, and RBI

By |2018-05-03T21:25:37+00:00June 29th, 2011|Broker Technology Research, Main category, MLS Insights|1 Comment


If you add up the comments across the real estate technology space during the past few days, you will find a resounding thunder of criticism over the quality of the S&P Case-Shiller index, powered by Fiserv data. Companies like, Zillow, and RBI were the most vocal on their blogs.

LPS and CoreLogic probably have opinions similar to Zillow and RBI. They have observed the weaknesses of the Case-Shiller index for years. I think that they are just a little less apt to douse Case-Shiller publically. Talk to any of the data specialists at either LPS or CoreLogic, and you will hear an accurate and technically sound assessment of the data set going into Case-Shiller.

Suffice it to say that Case-Shiller data from Fiserv is unconscious of sales that are happening in real time because it is not based on MLS data.

Consumers deserve the accurate truth about housing in America today. It is imperative that the real estate industry step forward and supply a market index using the quality of MLS data. It could spell the end of Case-Shiller and put a crimp in the $4 Billion in annual sales reported by Fiserv.

Today, I added in the Altos Research and Trulia market report widget into our WordPress blog. In three mouse clicks I can publish localized, up to date information  market data than Case-Shiller, and it covers my town! Don’t you think that the Nation’s MLSs should be providing a WordPress widget to their agents that supply this localized data in the markets that their members serve? Since only a minority of agents have WordPress sites today, perhaps they could start with a Facebook Widget 🙂

Arroyo Grande

Arroyo Grande, CA



This is the Altos Research report provided by the Altos Research WordPress Plugin.





Arroyo Grande median sales prices

Trulia Market Report




Trulia WordPress Plugin




One Comment

  1. supriya116 August 1, 2011 at 9:45 am - Reply

    Great post. William Raveis Real Estate just posted a similar article on our blog (also WordPress!!) talking about how misleading national data can be for homebuyers and sellers. http://blog.raveis.com/2011/07/21/public-misled-by-national-real-estate-indexes/ Case-Shiller purports that average sales prices are down year over year, but a more focused view using MLS data (we have data from 16 MLSs’ in the northeast, powered by our local housing data system) show average sales prices up for the same time period.
    I think it is also important to note the timeliness of data. Case-Shiller and other national indexes tend to post data that can be at least 2 months old. With the market in such a flux, this does not provide a completely accurate picture of recent local residential trends. We use data supplied on the 7th-10th business day of the following month.
    Also, dont you think that a market assessment based only on average sales prices (Case-Shiller) is severely lacking (Other indicators are extremely important-inventory, price per square foot, market time)? Would love to hear your thoughts. Thanks!

    Supriya Anand, William Raveis Real Estate

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