Show me the data that the median price lags the actual price by 18 months.
For that to happen, folks who compile statistics — DataQuick, OFHEO, Shiller — would have to selectively analyze the data, instead of taking 'all comers' and calculating a median.
Sounds like another conspiracy theory to me.
As SB said, there's a 2-3 month lag from signing the offer to close of escrow and publication of the results by DataQuick.
Please do update your website. Or, will there be an 18 month lag from August 2006 to the next update?