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Don’t Bet the Farm on New Home Sales Data

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August 14, 2012
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Written by John Lounsbury

The discussion that ensues in most of this article was written at the beginning of June.  Over the past three months the exchange-traded fund (ETF), the SPDR S&P Homebuilders (NYSE: XHB), has gain 5.16% almost exactly the same as the ETF for the S&P 500 (NYSE:SPY).  However, as can be seen in the following graphic, XHB has been much more volatile than SPY (especially to the downside) and since June 4 XHB has rebounded from a low for a gain since then about 15% compared to SPY’s gain of about 9.5%.

Click on chart for larger image.

xhb-spy-3-mo-performance-2012-august-13-380px

In the discussion that follows it will be shown that new homes sales data has wildly fluctuating correlation to the performance of XHB.  With the strong new homes sales data that was reported on June 25 an advance of 10% in XHB ensued in the next week.  That showed strong positive correlation.

When a sharp decline in new home sales was reported on July 25 there was a 4.5% rally over the next two days and more than 6% gained over the next three weeks.  That shows strong negative correlation.

Read on to find out why this type of behavior should not be a surprise.

The XHB ETF is only a little over six years old, so it doesn’t reflect a deep history of data. However, after its debut in February 2006, XHB has captured almost all of the housing bubble collapse and subsequent activity.

The following graph shows that there is an expected relationship between the numbers of new home sales and the price of XHB.

john-housing-2012-june-2-1

However, what appears at first glance to be a slam-dunk requires further examination, as one might suspect from the performance of XHB over the last two and a half months, discussed above.

The first question is whether the data that is announced early in the fourth week of each month can be used as a signal for buying XHB. If so, then the price of XHB a few days later at the end of the month should show some correlation to the change in the number of new home sales. XHB would be up for the month when new home sales increased and down when they decreased.

The following graph shows the correlation diagram for plotting monthly changes in XHB on the y-axis against the changes for the previous month in new home sales.

john-housing-2012-june-2-2

Only two encouraging facts emerge from the graph above:

  • The upward slope indicates that XHB does have a tendency to increase in price when new home sales increase.
  • The line does pass through the origin; the center of the data set indicates on average no change in XHB when there is no change in new home sales.

However, two discouraging factors also appear:

  • The scatter of the data is extreme; the R2 value indicates very poor correlation between changes in XHB and new home sales data.
  • The slope of the line indicates that on average there is only a 0.37 percent increase (decrease) in XHB price for each 1 percent increase (decrease) in new home sales.

It might be possible that the price of XHB for the month following each new home sales number would better reflect the expected effect. Not so. The correlation for the following month is actually (r = -0.01, or R2 = 0.0001). Therefore, in the case of the example given earlier, the April new home sales data announced May 23 will have, on average, no effect whatsoever on the price change for XHB in June.

The final question about the relationship between new home sales and XHB over more than six years involves the observation that the data is very noisy, especially the price of XHB. In such cases, moving averages may bring out relationships that are lost in the noise of fluctuation for single data points. The following table shows that the use of moving averages does give better results.

john-housing-2012-june-2-3

When three or more month moving averages are used:

  • The slope indicates an approximately 1:1 average change for XHB: new home sales.
  • The correlations improve to from “poor” to “weak.”

However, the improvements above are insufficient to provide a basis for good trading signals. The reason is obvious in the final graphic below. We have selected for analysis the three-month moving averages for the data because that is the shortest smoothing span that gives the improved but weak correlation and a slope near the expected 1:1 value.

john-housing-2012-june-2-4

The correlation coefficient for the entire 74 months (71 months of three-month moving averages) varies frequently from near -1 to near +1 when the correlations are viewed over three month spans. So, a few months after one has seen near perfect correlation between the new housing sales and XHB, it can frequently happen that the correlation will be reversed and be very negative.

When six-month correlations are plotted (not shown) the correlation swings are smoothed slightly. When 12-month correlations are plotted (not shown) the variation of correlation coefficient over time is smoothed further but still varies from a high near r = 0.2 to a low of r = -0.8, with peaks and valleys generally spaced by a little less than a year.

Looking back one more time at the first graph, we will again note that there are clearly long-term trend relationships between the direction of change for new home sales and the price of XHB. However, trying to use the relationship for making timing decisions for buying and selling the ETF is problematic. In fact, even looking at the trend changes, XHB clearly hit bottom in February 2009, but there are three low points for new homes sales in August 2010, October 2010 and February 2011. The rise in new home sales from February 2011 is sufficiently weak to indicate that a bottom for new home sales has yet to be reached.

Don’t use new home sales for making buying and selling decisions for homebuilders. Since February 2009, XHB is up about 150% (including 7 percent dividends). From the time of the first bottom in new home sales in August 2010, the gain is 56%; from the second triple bottom two months later, up 43%; and from the third triple bottom four months after the second, up only 22%.

Related Articles

May New Home Sales Come In Strong by John Lounsbury and Steven Hansen

June New Home Sales Soften But Is It Just Noise? by John Lounsbury and Steven Hansen

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After nearly 11 years of 24/7/365 operation, Global Economic Intersection co-founders Steven Hansen and John Lounsbury are retiring. The new owner, a global media company in London, is in the process of completing the set-up of Global Economic Intersection files in their system and publishing platform. The official website ownership transfer took place on 24 August.

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