Ignore The Case-Shiller Index; Focus On The Future Instead

Last week, Standard & Poor's released its Case-Shiller Index for December 2010. The index is a home valuation tracker, meant to meausure the change in home prices from one period to the next.

December's Case-Shiller Index showed major devaluations nationwide. As compared to December 2009, on a year-over-year basis, home values fell in 18 of the Case Shiller Index's 20 tracked markets, and the U.S. National Index dropped 4 percent overall. 

The retreat puts December's home values at similar levels as compared to early-2003.

That said, buyers and sellers would be wise to take the findings lightly. The Case-Shiller Index is inherently flawed. As such, its results are neither practical -- nor relevant -- to everyday Americans.

There are 3 Case-Shiller flaws, in fact.

The first flaw is the index's limited sample set. Wikipedia lists 3,100+ municipalities nationwide and we can be certain that real estate is bought and sold in all of them. The Case-Shiller Index, however, measures just 20 of them. That's less than 1% of all U.S. cities. And then, within those tracked cities, Case-Shiller reports an average, lumping disparate neighborhoods and streets into one big number.

The "national figures" aren't really national, and the "city data" doesn't apply to your home, specifically.

The second Case-Shiller Index flaw is how it measures home value changes. The index only consider at "repeat sales" of the same home, so long as that home is a single-family, detached property. Condominiums, multi-family homes, and new construction are ignored in the Case-Shiller Index.

Because distressed properties account for such a high percentage of resales lately -- 36% in December --foreclosures and short sales skew Case-Shiller Index worse.

And, lastly, the Case-Shiller Index is flawed by "age". Because it reports closed sales a 60-day delay, December's Case-Shiller Index is measuring the values of home sales contracts from September and October. The Case-Shiller Index, therefore, is a snapshot of the not-so-recent past, and does little to tell us about the next 60 days.

Overall, the Case-Shiller Index is helpful tool for economists and policy-makers, but it doesn't do much good for individual homeowners across the city of Atlanta or anywhere else. For accurate, real-time housing data in your local market, talk to a real estate professional instead.

The Home Price Index Shows Flat For November

Home values were reported unchanged in November 2010, on average, according to the Federal Home Finance Agency's Home Price Index. 

We say "on average" because the government's Home Price Index is a data composite for the country. The index doesn't measure citywide changes in places like Atlanta , nor does it get granular down to the neighborhood level.

Instead, the Home Price Index groups state data in 9 regions with each regions having as few as 4 states in it, and as many as 8.

Not surprisingly, each of the regions posted different price change figures for the period of October-to-November 2010.

A sampling includes:

• Values in the Pacific region rose +1.2%
• Values in the New England region rose +0.3%
• Values in the Mountain region fell -1.9%

The complete regional list is available at the FHFA website.

That said, none of these numbers are particularly helpful to today's home buyers and sellers and that's because everyday people don't buy and sell homes on the Regional Level. We do it locally and the government's Home Price Index can't capture data at that level.

It's a similar reason to why the Case-Shiller Index is irrelevant to buyers and sellers.

November's Case-Shiller Index showed home values down 1 percent in November, but that conclusion is a composite of just 20 cities nationwide -- and they're not even the 20 largest cities. Philadelphia, Houston and San Jose are conspicuously absent from the Case-Shiller list.

So why are reports like the Home Price and the Case-Shiller Index even published at all? Because, as national indicators, they help governments make policy, businesses make decisions, and banks make guidelines. Entities like that are national and require data that describe the economy as a whole. Home buyers and sellers, by contrast, need it locally.

Since peaking in April 2007, the Home Price Index is off 14.9 percent.