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Zillow statistics - determination of Q-o-Q values.

When the value is reported for a Q-o-Q change, how is that value determined? Is the definition of quarter (January/February/March - Q1; April/May/June - Q2; July/August/September - Q3; October/November/December - Q4) appropriate. If so, is the Q-o-Q value determined by simply taking the average of the Zillow Home Value Index for each month?

For a particular region (Highland Park), there is monthly information available since 1996 but Zillow does not provide Q-oQ data for some of the home categories and I'd like to calculate the information myself but wanted to verifiy this information before proceeding.  Thanks.
  • January 12 2011 - Staten Island
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