The process of doing so is not as straightforward as it sounds, because something might simultaneously explain both air-traffic and growth, and so it is necessary to go through a complicated econometric procedure to purge any correlation of air traffic and growth of variables that might explain both.
There was still a negative correlation between the size of the national debt and GDP growth, but there was no implied causal relationship or sudden change at 90 percent.
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In other words, using even the simplest strategy to bifurcate the market meant you still had a correlation of 90% regardless of whether you owned value or growth.
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Clearly correlation between tablet growth spikes heading into holidays and a lack of interest of purchasing notebooks in the same period.
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They found there was a correlation between increases in atmospheric aerosols and decreases in the growth rates of coral.
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Although he admits that it is hard to prove, he believes there is a correlation between a country's economic performance and the combined sales growth of its multinationals.
Using a variety of tests, they found virtually no correlation between an individual country's GDP growth rate per head and the returns to investors.
As you can see, there is a noticeable negative correlation, that is, increased flows of foreign aid are associated with somewhat lower economic growth.
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As you can see, there is no correlation between GDP growth and market capitalization in these two countries, so picking GDP growth of a country does not necessarily result in successful investment performance.
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People are fleeing the cold: there is a strong correlation between the average temperature in January and population growth, notes Edward Glaeser, a professor of economics at Harvard University.
The growth of exchange-traded funds is a much better explanation for the spike in correlation.
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