Standard & Poors released its Case-Shiller Index Tuesday.  The index is a monthly home valuation report from select cities and among the private sector’s most popular home pricing models.

In reviewing the April Case-Shiller Index and its accompanying analysis, it appears that the housing market’s rebound is gathering momentum.

In the index’s 20 tracked cities:

• 18 of 20 improved from March to April 2010
• Versus April 2009, home prices are up nearly 4 percent
• The two “down” cities from April — Miami and New York — are off just 0.5% and 1.0% annually, respectively

Furthermore, as another sign of strength, San Diego, a city in which homeowners have lost a lot of equity since 2007, has now shown 12 straight months of home price improvement.

However, the Case-Shiller Index must be kept in context. It’s far from perfect.

For one, the index reports on a 60-day delay; it’s only now showing data from the end of April, when the federal homebuyer tax credit was expiring. Home sales have been weak since then it’s been reported.

And second, the Case-Shiller Index is limited to just 20 cities nationwide. Therefore, the index doesn’t consider every home sale in every American city — it only considers a select few. Many more U.S. homes are excluded from the Case-Shiller Index than are included.

But, despite its flaws, the Case-Shiller Index remains important with respect to economic analysis. Much like the government’s Home Price Index, Case-Shiller helps to identify broader trends in housing that shape government and monetary policy.

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Home values rose in March, according to the Federal Home Finance Agency’s most recent Home Price Index. Values were reported higher by 0.3 percent, on average, from February.

We use the phrase “on average” because the Home Price Index is broad-reaching, national housing statistic. It ignores the dynamics of neighborhood real estate markets like Nashua as well as citywide markets like Bedford , too.

Instead, the Home Price Index focuses on state and regional statistics.

For example, in March 2010 as compared to February:

• Values in the East South Central region rose 2.5%
• Values in the Mountain states rose 1.1%
• Values in the Middle Atlantic states fell 1.0%

Of course, none of this data is especially helpful for today’s home buyers and sellers.

Real estate is a local phenomenon that can’t be summarized by state or region. What matters most to buyers and sellers is the economics of a neighborhood and that level of granularity can’t be served up by a national housing report like the Home Price Index.

The Home Price Index data is additionally unhelpful to buyers and sellers in that it reports on a 2-month delay.

In other words, Home Price Index is not even a fair reflection of today’s market — it highlights the real estate market as it existed 60 days ago.

So why is the Home Price Index even published? Because government, business and banks rely on the reports.  As a national indicator, the Home Price Index helps governments make policy, businesses make decisions, and banks make guidelines. This, in turn, trickles down to Main Street where it impacts every one of us — and eventually influences real estate.

Since peaking in April 2007, the Home Price Index is off 13.44 percent.

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