Click here for a look at which companies had the biggest gains and losses in percentage terms and for a brief analysis of each company's prospects.

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Now, a brief analysis of 10 European countries published Thursday in the Lancet --- the first to use government data on suicide rates from the past few years -- suggests that the ongoing economic downturn may be no different, and in fact may have had a larger impact on suicide rates than expected.

CNN: European suicides spiked during economic crisis

First, a brief discussion of instrumental variable analysis.

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