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What does 30 day change mean?

  • September 24 2013 - Great Kills
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Answers (3)

Profile picture for Blue Nile
Absolutely NOT!  It is about "estimates".  Zillow has no info on mortgage payments, other than the public records posted for the "pre-foreclosures".

It is an estimate of the change in the estimate from a month prior.
It is machine generated and no one checks them, and no one uses that number.

Here is a chart comparing actual change of the estimates to the estimated change of the estimates for selected properties:



Here is the percent difference between the estimated change and the calculated change for the same properties:



Even the calculated change is meaningless as it is only a change of the "ESTIMATES", which have a much wider tolerance margin than the typical monthly changes.
  • September 27 2013
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Profile picture for user1331492
Could the ammount listed thee be how much the home owner may be behind in mortgage payments?
  • September 27 2013
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Profile picture for Blue Nile
Nobody knows; not even Zillow.  It is not the difference between the estimates from 30 days prior, nor even the closest estimate to 30 days prior since they are only run nominally 3 times per week.

On a thread "how doe Zillow do math", Russ from Zillow customer service stated: "the data labeled as "30-day change" is an approximation, in fact, so is technically mislabeled(and potentially misleading, certainly). For various technical reasons we do not store all data required to calculate the exact 30-day change."
  • September 24 2013
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