Readers whose native language is not English might not know that the expression, 'cherry picking', refers to the practice of using out-of-context and unanalyzed data to prove what is proposed as a hypothesis but is, in reality, a foregone conclusion. The habit is widespread among the chattering class. Here's an example.
An article in the real estate promotion website, El Idealista, again mentions another frequently cited comparison between the United States and Spain. Departing slightly from the usual story that there are an equal number of unsold new homes in this country as in the U.S., this version of it is that (translation ours) '...in recent years, 860,000 new homes have been started in Spain while in countries like the U.S., with nearly seven times the population, work was begun on 1.1 million dwellings'.
The source of this information was a recent speech given by the chairman of the economics and business department of Pompeu Fabra University, José García-Montalvo. Given that this gentleman's webpage motto is: "Without data you are just one more person with an opinion", we are thinking that a bit of statistical background to this glaring disparity might be of use to readers who do not wish to be lumped in with that crowd of noisy uninformed.
Using 2007 through 2nd quarter 2009 Spanish home sales data from the INE and American figures for the same period from the U.S. Census Bureau and the National Association of Realtors and comparing them, for the sake of ease, with CIA World Factbook estimates of current population in both countries, we come up with the following information:
1). Of the 12,776,000 total homes sold in the U.S. since December 2006, 1,448,000 were new;
2). In the same period here, 1,534,000 homes got new owners - 717,000 of these were newly built;
3). Put otherwise, 11% of total sales in the U.S. involve new construction. 47% in Spain;
4). Summing all, both new and second hand, sales over the period in both countries and calculating this as sales per 1,000 residents we find that the United States' figure of 41.59 only slightly outperforms the 37.86 registered in Spain. Much of this difference might be explained by the Census Bureau's rather peculiar methodology, which counts signed sale contracts as actual 'sales', regardless as to whether they are actually consummated. The widespread use of clauses making deals contingent on the buyer's success in selling his or her current residence causes this data to grossly overestimate the number of actual sales in a slow market in which it is difficult to match transactions over the typical 90-day closing period - this not to mention the number of buyers who merely walk away from what is turning into a bad deal as prices drop.*
Did somebody mention something about data and opinions?**
*Add to this the higher birthrate in the U.S., and the consequent lesser proportion of people of home-buying age, this comparison draws even closer in real life. And after all that, there is a very large difference between Spanish population estimates and those of the CIA, this time turning the tide against Spain in this regard.
**We, in fact, were rather surprised to read that Mr. García-Montalvo hauled out this canard. His now disappeared blog, MontalvoLand, was generally a pretty good read.
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