Why You Shouldn't Put Too Much Faith In October's Case-Shiller Index

The Case-Shiller Index posted awful numbers in its most recent reading. Each of the index's 20 tracked markets showed home price deterioration between September's and October's respective reports. Some markets fell as much as 2.9 percent.

The drop in values is nothing about which to panic, however. The Case-Shiller Index is just re-reporting what we already knew. It's a common theme with the Case-Shiller Index, actually; a trait traced to the report's methodology.

The Case-Shiller Index is an imperfect housing indicator with 3 inherent flaws.

The first flaw is that the index makes use of a limited data set, tracking values in just 20 cities nationwide. That data set is then projected across the more than 3,100 other municipalities in the United States. The "national figures", therefore, aren't really national.

The second flaw is that, even within the tracked 20 cities, not all home sales are included. The Case-Shiller Index only tracks sales of single-family, detached homes, and within that market subset, it only uses homes that are "repeat sales". This specifically excludes sales of condominiums and multi-family homes, and new construction.

Lastly, Case-Shiller Index's third flaw is its "age". The Case-Shiller Index reports on a 60-day delay, and the values it reports are tied to contracts written even longer ago.  Sales contracts from July and August are responsible for October's closings so when we see the Case-Shiller Index as reported in December, some of the data it's reporting is 5 months old already. That's too old to be relevant.

Looking back at 2010, housing was at its weakest between May and August. Therefore, it's no surprise that the most recent Case-Shiller Index shows significant weakness.  Looking forward, we should expect the report to improve -- especially because of how strong New Home Sales and Existing Home Sales have been since summer.

The Case-Shiller Index is helpful for economists and policy-makers. It's not much good for individual homeowners, however. For accurate, real-time housing data, talk to a real estate professional instead.

Home Inventory Dwindles Into The New Year

Existing Home Sales jumped another 6 percent in November, the report's third month of improvement since bottoming in July.

According to the National Association of REALTORS®, a quarter-million more existing homes were sold during the annual period ending in November as compared to October.  An "existing home" is a home that cannot be considered new construction.

Additionally, the national housing supply dropped by a full month. At the current pace of existing home sales, the complete stock of homes for sale will be exhausted in 9.5 months.

November's strong housing data is yet another signal to buyers that the housing market's foundation has been rebuilt, and that a rebound is imminent.  It's helped that there are great "deals" on which for buyers to pounce.

In November, short sales and foreclosures accounted for one-third of all existing homes sold, and carried an average price discount of 10 percent and 15 percent, respectively, as compared to non-distressed sales.

Repeat buyers continue to power the market, too, representing more than half of all home buyers.

• First-time buyers : 32% of all buyers
• Investors : 19% of all buyers
• Repeat buyers : 51% of all buyers

This breakdown suggests that housing has regained its footing. First-time buyers can't support a market long-term like repeat buyers can and, as compared to 12 months ago, the percentage of repeat buyers is now up 14 points.

Home buyers take note. Raw sales volume is rising and available inventory is dropping. Basic supply-and-demand tells us that this will lead home prices higher. Furthermore, mortgage rates are rising quickly, increasing the cost of homeownership.

If buying a home is a part of your plan for 2011, consider accelerating your purchase time frame. Existing homes account for more than 80% of homes sold nationwide. If the market keeps improving like this, your home affordability will worsen.

Home Affordability Reaches Record-Levels... Last Quarter.

Last quarter, with home prices still relatively low and mortgage rates making new, all-time lows almost weekly, the cost of home ownership was extraordinarily low in most U.S. markets.

According to the National Association of Home Builders' quarterly Home Opportunity Index, 72.5 percent of all new and existing homes sold between June-September 2010 were affordable to families earning the national median income. This ties the all-time high for home affordability, set in the first quarter of 2009.

The data also underscores that, when compared to historical norms, it's a fantastic time to be a home buyer.

Prior to 2009, the Home Opportunity Index rarely topped 65. The index has remained above 70 ever since.

All real estate is local, though, and on a city-by-city basis, home affordability varied last quarter.

For example, 96% of homes sold in Kokomo, IN are affordable for families earning the area's median income. This handily beat the average figure and led the nation. Looking at major cities, Indianapolis led the pack.

93% of homes in Indianapolis are affordable to families earning the area's median income. This ranks #9 nationwide.

On the opposite end of the affordability scale is the New York-White Plains, NY-Wayne, NJ region. For the 10th consecutive quarter, the New York Metro region ranks last in U.S. home affordability. Just 23% of homes are affordable to families earning the local median income, although this is 3 points higher versus Q1 2010.

The rankings for all 225 metro areas are available online.

Regardless of where your hometown ranks relative to its neighbors, home affordability remains high as compared to historical values. That said, with mortgage rates rising and home sales expected to climb this winter, it's unlikely that the Home Opportunity Index will improve.

Buying a home may never be this inexpensive again. If you planned to buy in mid-2011, consider moving up your time frame.

September's Case-Shiller Index Reflects A Slowing Housing Market

Standard & Poors released the September Case-Shiller Index Tuesday. The Case-Shiller Index is a home-value tracker. The report shows home prices down 0.7% from August and values fading, in general.

Case-Shiller representatives assessed the findings as "another weak report; weaker than last month", citing deterioration in 18 of 20 tracked markets. Upward pricing momentum from the summer is slowing and values remain 30% off the market's June 2006 peak. It could spell bad news for home sellers this winter.

That said, the Case-Shiller Index is imperfect; its methodology flawed. The index is not meant for use by individual buyers or sellers -- for 3 reasons.

First, the Case-Shiller Index reports on a 2-month delay. Today is December 1 and we're discussing data from September. In the 8 weeks since, the economy has shifted to a net jobs gainer, and the Federal Reserve has committed to $600 billion in re-investment.  These are major developments that weren't a part of September's housing market, but are relevant today.

Especially because employment is largely believed to be a keystone to housing.

Second, the Case-Shiller sample set is limited to just 20 cities nationwide. This means that most U.S. home sales are specifically not included in the Case-Shiller Index's monthly findings.

And that ties into reason number three -- all real estate is local. No matter what the Case-Shiller Index says about the country, what matters to your local market is what's happening in your local market. Each neighborhood has its own housing economy and that's something that can't be captured by a national report.