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Data analysts using Big Data to track China economy

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Mr Wu has used Baidu's search and map data to find so-called ghost cities, betrayed by buildings that show little mobile-phone activity.

Beijing

WU Haishan was at Princeton University studying how schools of fish swim together when the crowd behaviour of a much bigger group grabbed his attention: 1.35 billion fellow Chinese.

It was Chinese New Year back home in 2014, and Baidu Inc, operator of the country's biggest...

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