Has there ever been as study of which AVM is most accurate?

[Jim Tiernan]

When looking for deals, I often have to come up with an ARV (after repaired value) for a property.

There are many AVMs (automated valuation models) out there. Redfin, RealQuest, Zillow, Realtor, Chase, FindCompsNow, PropertyShark, Remax etc.

Has there ever been a study of which one is most accurate?

Is there a site that consolidates all these AVMs into one list?

Any good AVM sites that I am missing?

Thanks,

Jim