Zillow Pricing

edited October 2008 in Seattle Real Estate
I understand that Zillow uses some kind of complex metric to get its price estimates, but does anyone understand what kind of logic could be forcing Zillow to say that some houses in Seattle are going up in value?

Here's my example:
http://www.redfin.com/WA/Seattle/921-NW ... ome/494093

I don't see how a house that had multiple price reductions (from 445 down to 420) between June and September and still cannot sell in October after at least 128 days on market could possibly have increased in value in that time. What kind of metric would actually make that prediction?
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