But according to the researchers, this is the first time that a direct correlation has been made between ozone levels and heart attacks.
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The key takeaway is that middle class America is disgusted with the financial markets to the point where their expectations, for the first time in decades, have no correlation with the reality of the economic situation.
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For the time periods we can observe, we find that the intra-portfolio correlation is, by and large, less the longer the period of time for which we have observations.
These sorts of factors become very important in teasing causality from correlation in small numbers over time.
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"There's been a near-perfect correlation in equities gains each time the Fed induced more liquidity into the marketplace, " said Mark Luschini, chief investment strategist at Janney Montgomery Scott.
This chart (with 2009 data from OECD) is evidence of at least some correlation between obesity and the amount of time spent eating.
In spite of dramatic differences in the rates of the four cancers by race and sex, as well as dramatic changes over the 35-year time period, there was little evidence of a correlation between prevalence of mentholated cigarette use and cancer rates.
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What if there was a low-correlation strategy right under our noses the entire time?
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For example, the correlation between average pairs of stocks more than tripled between 2007 and 2010 and the correlation between categories more than doubled during that time period.
Correlation seems enough for them most of the time.
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While longer talking time corresponded to more power for male senators, it appeared to have only a neutral correlation for female senators, she says.
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State licensing laws mindlessly emphasize time spent -- usually years -- taking teacher-education courses, yet there is little correlation between certification requirements and effectiveness in the classroom.
If two stockmarket indices always move linearly in the same direction at the same time, and the relative size of their movements is always the same, they have a perfect correlation of 1.
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