How many data points are typically needed before Zillow posts a calculation?

Profile picture for Alford317
How many data points are required to post a median calculation.  Or, how can I find out how many data points were used to come to a posted number? 
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January 18 2011 - Montgomery
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Answers (3)

Profile picture for Alford317
I've reposted the question to be a little more clear.  Instead of data points, lets say houses.  How many houses does zillow use to calculate a median?  For example, Zillow  posts the median sale price per square foot for a location.  How many data points (houses) are used to determine the median.  My point being, I can calculate the median of three data points (houses), but a median of 3000 data points (houses) is a much more representative sample which creates a clearer picture of the market and therefore allows the buyer to make a more informed decision.  Thanks for your help.
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January 20 2011
Profile picture for Alford317
Instead of data points, lets say houses.  How many houses does zillow use to calculate a median?  For example, Zillow calculates and posts the median sale price per square foot for a location.  How many data points houses are used to determine the median.  My point being, I can calculate the median of three data points (houses), but a median of 3000 data points (houses) is a much more representative sample which creates a clearer picture of the market and therefore allows the buyer to make a more informed decision.  Thanks for your help! 
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January 20 2011
Profile picture for travisbroadwater
I'm not sure I understand your question, its a bit vauge. Data points for which calculation? 
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January 18 2011
 

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