Case-Shiller: Low Tier Boosted by Expiring Tax Credit

It’s time for our monthly check-in of the S&P/Case-Shiller Home Price Indices (HPI). The Case-Shiller data is generally considered to be the most reliable measure of overall home price changes for a region, since they only consider repeat sales of homes when calculating their index, instead of looking at all the homes that sold in a given month.

For the full source data behind this post, hit the S&P/Case-Shiller website (requires free registration). For a more detailed explanation of how the Case-Shiller Home Price Index is calculated, check out their methodology pdf. Also remember that the data released on the last Tuesday of a given month is for the period two months prior (i.e. – April data is released in June).

Here are the basic Case-Shiller stats for the New York City commuter area* as of April:

April 2010
Month to Month: Down 0.3%
Year to Year: Down 1.0%
Prices at this level in: April 2004
Peak month: June 2006
Change from Peak: Down 21.7% in 46 months
Low Tier: Under $279,579
Mid Tier: $279,579 to $428,491
Hi Tier: Over $428,491

Just two of the twenty metro areas tracked by Case-Shiller saw a decrease in their respective HPIs between March and April (vs. 14 February to March): New York fell 0.3% and Miami fell 0.8%.

Here’s a look at New York’s latest tiered data, back through 2000:


And here’s a closer look at the recent changes, with the vertical and horizontal axes zoomed in to show just the last year:


Not surprisingly, the pending expiration of the tax credit is boosting low-end prices, while the middle and high tiers see little to no benefit. The low tier was up 0.8%, the middle tier dropped 1.3%, and the high tier inched up 0.1%

Here’s a chart of Case-Shiller HPIs for all the markets that Redfin serves:


Here’s our peak decline chart, in which we line up the peak Case-Shiller HPI value for each of Redfin’s markets, so we can see how long each market has been declining, and how much it has dropped from the peak.


Here’s the flip side of the peak decline chart—a graph since January 2009, indexed to January 2009 = 100%:


Looks like it’s tax credit price boost time all across the country. One more hurrah before all that free money disappears.

Methodology: The Case-Shiller index tracks price changes in sets of homes of similar size and style to better determine changes in what people are willing to pay for the same home over time. If data is available from an earlier transaction for the same home, the two sales are paired and treated as a “repeat sale.” Repeat sales that are too far apart, sales between family members, lot splits, remodels, and property type changes (e.g. from single-family to condos) are excluded from the calculations. All remaining repeat sales are totaled together and weighted based on the time between each sale, then the data for the most recent three months is averaged together to create a given month’s index value (i.e. – March’s index represents the average of the data from January through March).

The three price tiers plotted in the charts below simply represent the top, middle, and bottom third of all sales, based on the initial sale price. In other words, if there were 3,000 sales in the three-month period, 1,000 of them would be in the low tier, 1,000 in the middle tier, and 1,000 in the high tier, by definition.

*[Case-Shiller defines the New York City commuter area as all of Fairfield, New Haven, Bergen, Essex, Hudson, Hunterdon, Mercer, Middlesex, Monmouth, Morris, Ocean, Passaic, Somerset, Sussex, Union, Warren, Bronx, Dutchess, Kings, Nassau, New York, Orange, Putnam, Queens, Richmond, Rockland, Suffolk, Westchester, and Pike counties.]

  • Onyx on the Bay Condo

    Very informative real estate blog. Thanks I have bookmarked this one.