Bobbie, Thank you for doing this research it is extremely helpful in dispelling all of the myths about what Zillow is and what it is not..
Via
Bobbie Files Realtor® Berkley, Greater Taunton Homes for Sale (Keller Williams Realty):
With all the information out there avaiable to home sellers and home buyers, finding and getting the right information becomes a challenge.
Zillow is one of the most well known property valuation websites, but if you are using it to decide what to place your home on the market for or what the home you are looking to buy is worth you will getting inaccurate or irrelevant information.
This is a portion of the Zillow Data Coverage and Zestimate Accuracy graph. As you can see in Bristol County they are only within 5% of the sale price 24% of the time. That number is not good odds for either a seller or buyer to accurately price their home. In Plymouth County it goes down to 22%.
Definitions
Zestimate Accuracy/Star Rating: This rating is tied to the Median Error in an area.
The ratings are as follows:
= Best Zestimate 
= Good Zestimate 
= Fair Zestimate 
= Tax assessor's value, or unable to compute Zestimate accuracy - 0 stars = No valuation
Homes on Zillow: This indicates the percentage of homes for which we have data (e.g., number of bedrooms or bathrooms) in a particular locale. These are the homes you can find via maps or search on Zillow.com. Homes With Zestimates: We can only calculate Zestimates for homes where we have certain data, including transactions. This column indicates the percentage of homes in an area with Zestimates. Within 5% of Sale Price: This is the percentage of transactions in a location for which the Zestimate was within 5% of the transaction price. For example, in the Portland area, 30% of the time the Zestimate was within 5% of the selling price. Within 10% of Sale Price: This is the percentage of transactions in a location for which the Zestimate was within 10% of the transaction price. Within 20% of Sale Price: This is the percentage of transactions in a location for which the Zestimate was within 20% of the transaction price. Median Error: Half of the Zestimates in an area were closer than the error percentage and half were farther off. For example, in Seattle, Zestimates for half of the homes are within 8.2% of the selling price, and half are off by more than 8.2%.
As you can see from the legend I pasted above they rate their own ability to be accurate. In Plymouth County they gave themselves 2 Stars which is Fair accuracy. For easier understanding to me that is a D. My son would have been grounded for months if he ever came home with a grade like that.
If you are a home seller or home buyer and would like an accurate Market Report please contact me and I will give you a no obligation report on your home or a home you are looking to purchase.
Bobbie Files
Your Bristol and Plymouth County Realtor
Visit my website at www.BerkleyMass.com
Search for Berkley Ma Homes at: http://BerkleyHomes.BerkleyMass.com
Search for Taunton Ma Homes at: http://TauntonHomes.BerkleyMass.com
For those struggling to pay your mortgage payments please visit: http://shortsales.berkleymass.com
ARE YOU INTERESTED IN PURCHASING ONE OF THE INCREDIBLE FORECLOSURE BUYS ON THE MARKET???
VISIT - http://JustForeclosures.BerkleyMass.com
Lori Lincoln
Keller Williams Realty
508-878-0917
Search Thousands of MLS listings for Taunton,Rehoboth,Lakeville, Assonet,Somerset, Raynham, Easton
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This is great information, thanks for sharing your research! I hope more come across this info.