You can see the methodology that went into the report.
…Price trends varied widely by market and price segment. Inventory increased over the past year, but dropped as compared to the prior quarter as the number of sales has continued to decline. Average days on market and average listing discount expanded versus the prior year quarter but declined from the prior quarter. The mixed results for the quarter suggests that the overall Long Island/Queens market is moving “sideways” for the time being, with no clear pattern evident. The median sales price of a Long Island/Queens single family or condo was $445,000, down 2.2% from the prior year record median sales price of $455,000 and unchanged from the prior quarter median sales price. The average sales price was a record $530,916, up 1.3% from the record $524,073 seen in the prior year quarter and up 4.8% from the prior quarter average sales price of $506,580. Suffolk showed the most gains in average sales price with a record $469,331 average sales price, up 2.3% from the prior year quarter. Nassau was the next highest with a record $628,839 average sales price, up 1.7% from the prior year quarter. Queens showed the most weakness with a 2.9% decline to $484,847 from the record average sales price in the prior year quarter. The luxury market showed unexpected price growth this quarter as evidenced by the upper two quintiles in Suffolk and Nassau counties….
Download report: 3Q 2007 Long Island/Queens Market Overview [pdf]